free-for-dev

Developers and Open Source authors now have a massive amount of services offering free tiers, but it can be hard to find them all in order to make informed decisions.

This is list of software (SaaS, PaaS, IaaS, etc.) and other offerings that have free tiers for developers.

The scope of this particular list is limited to things infrastructure developers (System Administrator, DevOps Practitioners, etc.) are likely to find useful. We love all the free services out there, but it would be good to keep it on topic. It's a bit of a grey line at times so this is a bit opinionated; do not be offended if I do not accept your contribution.

You can help by sending Pull Requests to add more services. Once I have a good set of links in this README file, I'll look into a better layout for the information and links (help with that is appreciated too).

NOTE: This list is only for as-a-Service offerings, not for self hosted software.

Source Code Repos
Artifact Repos
Tools for Teams and Collaboration
Code Quality
Code Search and Browsing
CI / CD
Automated Browser Testing
Security and PKI
Management Systems
Log Management
Translation Management
Monitoring
Crash and Exception Handling
Search
Email
CDN and Protection
PaaS
BaaS
Web
DNS
IaaS
DBaaS
STUN, WebRTC, Web Socket Servers and Other Routers
Issue Tracking and Project Management
Storage and Media Processing
Design and UI
Data Visualization on Maps
Package Build System
IDE and Code Editing
Analytics, Events and Statistics
Visitor Session Recording
International Mobile Number Verification API and SDK
Payment / Billing Integration
Docker Related
Vagrant Related
Miscellaneous
APIs, Data and ML
Other Free Resources

Source Code Repos

bitbucket.org — Unlimited public and private repos (Git and Mercurial) for up to 5 users
chiselapp.com — Unlimited public and private Fossil repositories
github.com — Unlimited number of public repositories
about.gitlab.com — Unlimited public and private Git repos with unlimited collaborators
visualstudio.com — Unlimited private repos (Git and TFS) for up to 5 users/team
plasticscm.com — Free for individuals, OSS and nonprofit organizations
cloud.google.com — Free private Git repositories hosted on Google Cloud Platform. Supports syncing with existing GitHub and Bitbucket repos. Free Beta for up to 500 MB of storage
buddy.works — One free private project with a Git repository and continuous delivery integrated
codebasehq.com — One free project with 100 MB space and 2 users
NotABug - NotABug.org is a free-software code collaboration platform for freely licensed projects, Git based
Deveo - free cloud and Git, Mercurial, or SVN repositories.

Artifact Repos

central.sonatype.org - The default artifact repository for Apache Maven, SBT and other build systems.

Tools for Teams and Collaboration

scinote.net — Scientific data management and team collaboration. One Team with unlimited number of users, backup and 1 GB storage space
appear.in — One click video conversations, for free
meet.jit.si — One click video conversations, screen sharing, for free
flowdock.com — Chat and inbox, free for teams up to 5
slack.com — Free for unlimited users with some feature limitations
stride.com — Free for unlimited users with some feature limitations
gitter.im — Chat, for GitHub. Unlimited public and private rooms, free for teams up to 25
hangouts.google.com — One place for all your conversations, for free, need a Google account
seafile.com — Private or cloud storage, file sharing, sync, discussions. Private version is full. Cloud version has just 1 GB
yammer.com — Private social network standalone or for MS Office 365. Free with a bit less admin tools and users management features
helpmonks.com — Shared inbox for teams, free for Open Source and nonprofit organizations
typetalk.in — Share and discuss ideas with your team through instant messaging on the web or on your mobile
talky.io — Free group video chat. Anonymous. Peer‑to‑peer. No plugins, signup, or payment required
sourcetalk.net — Code discussion tool, free for open code talks
helplightning.com — Help over video with augmented reality. Free without analytics, encryption, support
evernote.com — Tool for organizing information. Share your notes and work together with others
wunderlist.com — Share your lists and work collaboratively on projects with your colleagues, free on iPhone, iPad, Mac, Android, Windows and the web
doodle.com — The scheduling tool you'll actually use. Find a date for a meeting two times faster
sendtoinc.com — Share links, notes, files and have discussions. Free for 3 and 100 MB
zoom.us — Secure Video and Web conferencing, add-ons available. Free limited to 40 minutes
ideascale.com — Allow clients to submit ideas and vote, free for 25 members in 1 community
filehero.io — Make it easy to access your company's file storage from a corporate download page. Free for 5 concurrent downloads
wistia.com — Video hosting with viewer analytics, HD video delivery and marketing tools to help understand your visitors, 25 videos and Wistia branded player
cnverg.com — Real-time shared visual workspace, whiteboard, GitHub integration. Free 5 GB, 5 spaces and 5 collaborators, no GitHub repos

Code Quality

tachikoma.io — Dependency Update for Ruby, Node.js, Perl projects, free for Open Source
gemnasium.com — Dependency Update for Ruby, Node.js projects, free for Open Source
deppbot.com — Automated Dependency Updates for Ruby projects, free for Open Source
landscape.io — Code Quality for Python projects, free for Open Source
codeclimate.com — Automated code review, free for Open Source
houndci.com — Comments on GitHub commits about code quality, free for Open Source
coveralls.io — Display test coverage reports, free for Open Source
scrutinizer-ci.com — Continuous inspection platform, free for Open Source
codecov.io — Code coverage tool (SaaS), free for Open Source
insight.sensiolabs.com — Code Quality for PHP/Symfony projects, free for Open Source
codacy.com — Automated code reviews for PHP, Python, Ruby, Java, JavaScript, Scala, CSS and CoffeeScript, free for Open Source
pullreview.com — Automated Code Review for Ruby in GitHub, Bitbucket and GitLab, free for Open Source
gocover.io — Code coverage for any Go package
goreportcard.com — Code Quality for Go projects, free for Open Source
inch-ci.org — Documentation badges for Ruby, JS and Elixir
scan.coverity.com — Static code analysis for Java, C/C++, C# and JavaScript, free for Open Source
webceo.com — SEO tools but with also code verifications and different type of advices
zoompf.com — Fix the performance of your web sites, detailed analysis
websitetest.com — Yotta's tool to optimize web sites, free limited version online
gtmetrix.com — Reports and thorough recommendations to optimize websites
browserling.com — Live interactive cross-browser testing, free only 3 minutes sessions with MS IE 9 under Vista at 1024 x 768 resolution
versioneye.com — Monitor your source code and notify about outdated dependencies. Free for Open Source and public repos
shields.io — Quality metadata badges for open source projects
beanstalkapp.com — A complete workflow to write, review and deploy code), free account for 1 user and 1 repository with 100 MB of storage
testanywhere.co — Automatic test website or web app continuously and catch bugs in the early stages, free 1,000 tests/month
srcclr.com — SourceClear to scan source code for vulnerabilities, multi-languages and OS
blamewarrior.com — Tool to automatically assign reviewers for new pull requests and track statistics of review process, free for Open Source
gerrithub.io — Gerrit code review for GitHub repositories for free
reviewable.io — Code review for GitHub repositories, free for public or personal repos
sonarqube.com — Automated source code analysis for Java, JavaScript, C/C++, C#, VB.NET, PHP, Objective-C, Swift, Python, Groovy and even more languages, free for Open Source

Code Search and Browsing

codota.com — Codota helps developers create better software, faster by providing insights learned from all the code in the world. Plugin available.
libraries.io — Search and dependency update notifications for 32 different package managers, free for open source
sourcegraph.com — Java, Go, Python, Node.js, etc., code search/cross-references, free for Open Source
searchcode.com — Comprehensive text-based code search, free for Open Source

CI / CD

codefresh.io — Free-for-Life plan: 1 build, 1 environment, shared servers, unlimited public repos
codeship.com — 100 private builds/month, 5 private projects, unlimited for Open Source
circleci.com — Free for one concurrent build
stackahoy.io — 100% free. Unlimited deployments, branches and builds
travis-ci.org — Free for public GitHub repositories
wercker.com — Free for public and private repositories
semaphoreci.com — Free for Open Source
shippable.com — 150 private builds/month, free for 1 build container, private and public repos
appveyor.com — CD service for Windows, free for Open Source
github.com — Comparison of Continuous Integration services
ftploy.com — 1 project with unlimited deployments
deployhq.com — 1 project with 10 daily deployments
hub.jazz.net — 60 minutes of free build time/month
styleci.io — Public GitHub repositories only
bitrise.io — An iOS CI/CD with 200 free builds/month
buddybuild.com — Build, deploy and gather feedback for your iOS and Android apps in one seamless, iterative system
gitlab.com — Create pipelines directly from Git repositories using GitLab's CI service
dependencyci.com — Continuous dependency checking for GitHub repositories, free for open source

Automated Browser Testing

gridlastic.com — Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month
saucelabs.com — Cross browser testing, Selenium testing and mobile testing, free for Open Source
browserstack.com — Manual and automated browser testing, free for Open Source
everystep-automation.com — Records and replays all steps made in a web browser and creates scripts,... free with fewer options
Applitools.com — smart visual validation for web, native mobile and desktop apps. Integrates with almost all automation solutions (like Selenium and Karma) and remote runners (Sauce Labs, Browser Stack). free for open source. A free tier for a single user with limited checkpoints per week.

Security and PKI

pyup.io — Monitory Python dependencies for security vulnerabilities and update them automatically. Free for one private project, unlimited projects for open source.
threatconnect.com — Threat intelligence: It is designed for individual researchers, analysts and organizations who are starting to learn about cyber threat intelligence. Free up to 3 Users
crypteron.com — Cloud-first, developer-friendly security platform prevents data breaches in .NET and Java applications
snyk.io — Snyk found and reported several vulnerabilities in the package.Limited to 1 private project (unlimited for open source projects)
vaddy.net — Continuous web security testing with continuous integration (CI) tools. 3 domains, 10 scans history for free
letsencrypt.org — Free SSL Certificate Authority with certs trusted by all major browsers
globalsign.com — Free SSL certificates for Open Source
stormpath.com — Free user management, authentication, social login and SSO
auth0.com — Hosted free for development SSO
getclef.com — New take on auth unlimited free tier for anyone not using premium features
ringcaptcha.com — Tools to use phone number as id, available for free
ssllabs.com — Very deep analysis of the configuration of any SSL web server
qualys.com — Find web app vulnerabilities, audit for OWASP Risks
alienvault.com — Uncovers compromised systems in your networkonth
duo.com — Two-factor authentication (2FA) for website or app. Free 10 users, all authentication methods, unlimited, integrations, hardware tokens
tinfoilsecurity.com — Automated vulnerability scanning. Free plan allows weekly XSS scans
acunetix.com — Free vulnerability and network scanning for 3 targets
ponycheckup.com — An automated security checkup tool for Django websites
foxpass.com — Hosted LDAP and RADIUS. Easy per-user logins to servers, VPNs and wireless networks. Free for 10 users
opswatgears.com — Security Monitoring of computers, devices, applications, configurations,... Free 25 users and 30 days history
bitninja.io — Botnet protection through a blacklist, free plan only reports limited information on each attack
onelogin.com — Identity as a Service (IDaaS), Single Sign-On Identity Provider, Cloud SSO IdP, 3 company apps and 5 personal apps, unlimited users
logintc.com — Two-factor authentication (2FA) by push notifications, free for 10 users, VPN, Websites and SSH
report-uri.io — CSP and HPKP violation reporting
cloudsploit.com — Amazon Web Services (AWS) security and compliance auditing and monitoring

Management System

bitnami.com — Deploy prepared apps on IaaS. Management of 1 AWS micro instance free
visualops.io — 3,600 instance hours/month free
jamf.com — Device management for iPads, iPhones and Macs, 3 devices free

Log Management

papertrailapp.com — 48 hours search, 7 days archive, 100 MB/month
logentries.com — Free up to 5 GB/month with 7 days retention
loggly.com — Free for a single user, see the lite option
sematext.com — Free up to 500 MB/day, 7 days retention
sumologic.com — Free up to 500 MB/day, 7 days retention
logz.io — Free up to 1 GB/day, 3 days retention

Translation Management

lingohub.com — Free up to 3 users, always free for Open Source
getlocalization.com — Free for public projects
webtranslateit.com — Free up to 500 strings
transifex.com — Free for Open Source
oneskyapp.com — Limited free edition for up to 5 users, free for Open Source
crowdin.com — Unlimited projects, unlimited strings and collaborators for Open Source
instant.cm — Free for up to 2 languages and 20,000 requests/month

Monitoring

cloudsploit.com — AWS security and configuration monitoring. Free: unlimited on-demand scans, unlimited users, unlimited stored accounts. Subscription: automated scanning, API access, etc
opbeat.com — Instant performance insights for JS developers. Free with 24 hours data retention
checkmy.ws — Free 15 days full demo and 3 websites, forever free for Open Source
appneta.com — Free with 1 hour data retention
thousandeyes.com — Network and user experience monitoring. 3 locations and 20 data feeds of major web services free
datadoghq.com — Free for up to 5 nodes
stackdriver.com — Free monitoring up to 10 servers/hosted services
keymetrics.io — Free for 2 servers and 1 user
newrelic.com — Free with 24 hours data retention
nodequery.com — Free basic server monitor up to 10 servers
watchsumo.com — Free website monitoring, 50 http(s), Ping or keywords, every 5+ minutes
runscope.com — Monitor and log API usage. Single user 25,000 requests/month free
circonus.com — Free for 20 metrics
uptimerobot.com — Website monitoring, 50 monitors free
statuscake.com — Website monitoring, unlimited tests free with limitations
bmc.com — Free 1 second resolution for up to 10 servers
ghostinspector.com — Free website and web application monitoring. Single user, 100 test runs/month
java-monitor.com — Free monitoring of JVM's and uptime
sematext.com — Free for 24 hours metrics, unlimited number of servers, 10 custom metrics, 500,000 custom metrics data points, unlimited dashboards, users, etc
stathat.com — Get started with 10 stats for free, no expiration
skylight.io — Free for first 100,000 requests (Rails only)
appdynamics.com — Free for 24 hours metrics, application performance management agents limited to one Java, one .NET, one PHP and one Node.js
deadmanssnitch.com — Monitoring for cron jobs. 1 free snitch (monitor), more if you refer others to sign up
librato.com — Free up to 100 metrics at 60 seconds resolution
freeboard.io — Free for public projects. Dashboards for your Internet of Things (IoT) projects
loader.io — Free load testing tools with limitations
speedchecker.xyz — Performance Monitoring API, checks Ping, DNS, etc
blackfire.io — Blackfire is the SaaS-delivered Application Performance Solution. Free Hacker plan (PHP only)
apimetrics.io — Automated API Performance Monitoring, Testing and Analytics. Free Plan, manually make API calls and Run from their West Coast servers
opsdash.com — Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services
healthchecks.io — Monitor your cron jobs and background tasks. Unlimited free checks
appbeat.io — Website monitoring, 3 monitors free. They offer very reliable and affordable monitor service.
dnsspy.io — Monitor your DNS and get alerts for changes, RFC-violating DNS configs, ... Free for 1 domain, open source maintainers may apply for a free premium account.
monique.io — Create dashboards directly from SQL results, JSON data, API respones, Unix commands' output. Define alarms in Javascript. Free for 25000 submissions per month.
assertible.com - Automated API testing and monitoring. Free plans for teams and individuals.
letsmonitor.org - TLS certificate expiration and connectivity monitoring with email and SMS alerts.

Crash and Exception Handling

rollbar.com — Exception and error monitoring, free plan with 5,000 errors/month, unlimited users, 30 days retention
bugsnag.com — Free for up to 2,000 errors/month after the initial trial
sentry.io — Sentry tracks app exceptions in real-time, has a small free plan. Free, unrestricted use if self-hosted

Search

algolia.com — Hosted search-as-you-type (instant). Free hacker plan up to 10,000 documents and 100,000 operations. Bigger free plans available for community/Open Source projects
swiftype.com — Hosted search solution (API and crawler). Free for a single search engine with up to 1,000 documents. Free upgrade to premium level for Open Source
bonsai.io — Free 1 GB memory and 1 GB storage
searchly.com — Free 2 indices and 5 MB storage
indexisto.com — Site search, free 10 million documents index limit with advertisement block

Email

mailinator.com — Free, public, email system where you can use any inbox you want
sparkpost.com — First 15,000 emails/month free
mailgun.com — First 10,000 emails/month free
tinyletter.com — 5,000 subscribers/month free
mailchimp.com — 2,000 subscribers and 12,000 emails/month free
sendloop.com — 2,000 subscribers and 10,000 emails/month free
sendgrid.com — 12,000 emails/month and 2,000 contacts free
phplist.com — Hosted version allow 300 emails/month free
mailjet.com — 6,000 emails/month free
sendinblue.com — 9,000 emails/month free
mailtrap.io — Fake SMTP server for development, free plan with 1 inbox, 50 messages, no team member, 2 emails/second, no forward rules
postmarkapp.com — First 25,000 emails free
zoho.com — Free email management and collaboration for up to 10 users
domain.yandex.com — Free email and DNS hosting for up to 1,000 users
moosend.com — Mailing list management service. Free account for 6 months for startups
debugmail.io — Easy to use testing mail server for developers
mailboxlayer.com — Email validation and verification JSON API for developers. 1,000 free API requests/month
mailcatcher.me — Catches mail and serves it through a web interface
yopmail.fr — Disposable email addresses
kickbox.io — Verify 100 emails free, real-time API available
inumbo.com — SMTP based spam filter, free for 10 users
biz.mail.ru — 5,000 mailboxes with 25 GB each per custom domain with DNS hosting
maildocker.com — First 10,000 emails/month free
sendpulse.com — 50 emails free/hour, first 12,000 emails/month free
pepipost.com — Unlimited emails free for first three months, then first 25,000 emails/month free
elasticemail.com — First 150,000 emails/month free
appmail.io — First 10,000 emails free
mail-tester.com — Test if email's dns/spf/dkim/dmarc settings are correct, 20 free/month

CDN and Protection

cloudflare.com — Basic service is free, good for a blog, it also offers a free SSL certificate service
bootstrapcdn.com — CDN for bootstrap, bootswatch and fontawesome.io
cdnjs.com — CDN for JavaScript libraries, CSS libraries, SWF, images, etc
jsdelivr.com — CDN of OSS (JS, CSS, fonts) for developers and webmasters, accepts PRs to add more
developers.google.com — The Google Hosted Libraries is a content distribution network for the most popular, Open Source JavaScript libraries
asp.net — The Microsoft Ajax CDN hosts popular third party JavaScript libraries such as jQuery and enables you to easily add them to your Web application
toranproxy.com — Proxy for Packagist and GitHub. Never fail CD. Free for personal use, 1 developer, no support
rawgit.com — Free limited traffic, serves raw files directly from GitHub with proper Content-Type headers
incapsula.com — Free CDN and DDoS protection
fastly.com — Free CDN, all features until USD 50/month is reached, enough for most, then pay or suspended
Web Support Revolution — Free CDN, backup, firewall, antivirus and monitoring.
athenalayer.com — Free DDoS protection with unlimited websites
section.io — A simple way to spin up and manage a complete Varnish Cache solution. Supposedly free forever for one site
netdepot.com — First 100 GB free/month
speeder.io — Uses KeyCDN. Automatic image optimization and free CDN boost. Free and does not require any server changes
jare.io — You should login using your GitHub account and register your domain. Uses AWS CloudFront

PaaS

cloud.google.com — Google App Engine gives 28 instance hours/day free, 1 GB NoSQL database and more
engineyard.com — Engine Yard provides 500 free hours
azure.microsoft.com — MS Azure gives USD 200 worth of free usage for a trial
appharbor.com — A .Net PaaS that provides 1 free worker
heroku.com — Host your apps in the cloud, free for single process apps
firebase.com — Build real-time apps, free plan has 100 max. connections, 10 GB data transfer, 1 GB data storage, 1 GB hosting storage and 10 GB hosting transfer
bluemix.net — IBM PaaS with a monthly free allowance
outsystems.com — Enterprise web development PaaS for on-premise or cloud, free "personal environment" offering allows for unlimited code and up to 1 GB database
platform.telerik.com — Build and deploy mobile applications using JavaScript. Free plan has 100 MB data storage, 1 GB file storage, 5 GB bandwidth, 1 million push notifications for BaaS offering, 100 active devices for analytics
scn.sap.com — The in-memory Platform-as-a-Service offering from SAP. Free developer accounts come with 1 GB structured, 1 GB unstructured, 1 GB of Git data and allow you to run HTML5, Java and HANA XS apps
mendix.com — Rapid Application Development for Enterprises, unlimited number of free sandbox environments supporting 10 users, 100 MB of files and 100 MB database storage each
pythonanywhere.com — Cloud Python app hosting. Beginner account is free, 1 Python web application at your-username.pythonanywhere.com domain, 512 MB private file storage, one MySQL database
configure.it — Mobile app development platform, free for 2 projects, limited features but no resource limits
pagodabox.io — Small worker, web server, cache and database for free
zeit.co/now — Managed platform for Node.js, static sites and Docker deployments. Limited to 3 concurrent instances, 1 GB storage and 1 GB bandwidth for OSS projects (source files are exposed on a public URL)
sandstorm.io — Sandstorm is an open source operating system for personal and private clouds. Free plan offers 200 MB storage and 5 grains free
gearhost.com — Platform for .NET and PHP apps. 256 MB of RAM for free on a shared server with limited resources

BaaS

appacitive.com — Mobile backend, free for the first 3 months with 100,000 API calls, push notifications
bip.io — A web-automation platform for easily connecting web services. Fully open GPLv3 to power the backend of your Open Source project. Commercial OEM License available
blockspring.com — Cloud functions. Free for 5 million runs/month
kinvey.com — Mobile backend, starter plan has unlimited requests/second, with 2 GB of data storage, as well as push notifications for up 5 million unique recipients. Enterprise application support
backendless.com — Mobile and Web Baas, with 1 GB file storage free, push notifications 50000 month, and 1000 data objects in table.
konacloud.io — Web and Mobile Backend as a Service, with 5 GB free account
layer.com — The full-stack building block for communications
quickblox.com — A communication backend for instant messaging, video and voice calling and push notifications
pushbots.com — Push notification service. Free for up to 1.5 million pushes/month
onesignal.com — Unlimited free push notifications
getstream.io — Build scalable news feeds and activity streams in a few hours instead of weeks, free for 3 million feed updates/month
tyk.io — API management with authentication, quotas, monitoring and analytics. Free cloud offering
iron.io — Async task processing (like AWS Lambda) with free tier and 1 month free trial
stackhut.com — Async task processing (like AWS Lambda). 10 free private services and unlimited free public services
pubnub.com — Free push notifications for up to 1 million messages/month and 100 active daily devices
reappt.io — Realtime Messaging for browsers, smartphones and everyone. 100 concurrent connections. Free 10 GB data/month
webtask.io — Run code with an HTTP call. No provisioning. No deployment
zapier.com — Connect the apps you use, to automate tasks. 5 zaps, every 15 minutes and 100 tasks/month
stackstorm.com — Event-driven automation for apps, services and workflows, free without flow, access control, LDAP,...
simperium.com — Move data everywhere instantly and automatically, multi-platform, unlimited sending and storage of structured data, max. 2,500 users/month
stamplay.com — Connect services together with a visual interface. 50,000 API calls, 100 GB data transfer and 1 GB storage for free

Web Hosting

closeheat.com — Development Environment in the Cloud for Static Websites with Free Hosting and GitHub integration. 1 free website with custom domain support
serverpilot.io ServerPilot, and we'll install everything you need to host PHP apps like WordPress. Unlimited servers, 1 SSH/SFTP user
sourceforge.net — Find, Create and Publish Open Source software for free
devport.co — Turn GitHub projects, apps and websites into a personal developer portfolio
netlify.com — Builds, deploy and hosts static site or app, free for 100 MB data and 1 GB bandwidth
pantheon.io — Drupal and WordPress hosting, automated DevOps and scalable infrastructure. Free for developers and agencies
acquia.com — Hosting for Drupal sites. Free tier for developers. Free development tools (such as Acquia Dev Desktop) also available
bitballoon.com — Hosting for static sites and apps. Free on a subdomain
readthedocs.org — Free documentation hosting with versioning, PDF generation and more
bubble.is — Visual programming to build web and mobile apps without code, free 100 visitors/month, 2 apps
contentful.com — Content as a Service. Content management and delivery APIs in the cloud. 3 users, 3 repositories and 100,000 API requests/month for free
tilda.cc — One site, 50 pages, 50 MB storage, only the main pre-defined blocks among 170+ available, no fonts, no favicon and no custom domain
surge.sh — Static web publishing for Front-End developers. Unlimited sites with custom domain support

DNS

freedns.afraid.org — Free DNS hosting
dns.he.net — Free DNS hosting service with Dynamic DNS Support
luadns.com — Free DNS hosting, 3 domains, all features with reasonable limits
domain.yandex.com — Free email and DNS hosting for up to 1,000 users
selectel.com — Free DNS hosting, anycast, 10 geo zones
cloudns.net — Free DNS hosting up to 3 domains with unlimited records
ns1.com — Data Driven DNS, automatic traffic management, 1 million free queries
zonewatcher.com — Automatic backups and DNS change monitoring. 1 domain free
namecheap.com — Free DNS. No limit on number of domains
dynu.com — Free dynamic DNS service

IaaS

aws.amazon.com — AWS Free Tier, free for 12 months
developer.rackspace.com — Rackspace Cloud gives USD 50/month for 12 months
cloud.google.com/compute — Google Compute Engine gives USD 300 over 12 months
virtzone.net — Free VPS. You must meet certain minor qualifications
backblaze.com — Backblaze B2 cloud storage. Free 10 GB (Amazon S3-like) object storage for unlimited time
trystack.org — Free Openstack hosting. The environment is resets every 24 hours, suitable for testing only
dply.co — Create a cloud server FREE for 2 hours. Backend host is Digitalocean.

DBaaS

cloudant.com — Hosted database from IBM, free if usage is below USD 50/month
orchestrate.io — 1 application free
redislabs.com — Redis as a Service, 30 MB and 30 concurrent connections free
backand.com — Back-end as a service for AngularJS
zenginehq.com — Build business workflow apps in minutes, free for single users
redsmin.com — Online real-time monitoring and administration service for Redis, 1 Redis instance free
graphstory.com — GraphStory offers Neo4j (a Graph Database) as a service
elephantsql.com — PostgreSQL as a service, 20 MB free
graphenedb.com — Neo4j as a service, up to 1,000 nodes and 10,000 relations free
mlab.com — MongoDB as a service, 500 MB free
MongoDB Atlas — free tier gives 512 MB
scalingo.com — Primarily a PaaS but offers a 512 MB free tier of MySQL, PostgreSQL or MongoDB
skyvia.com — Cloud Data Platform, offers free tier and all plans are completely free while in beta
airtable.com — Looks like a spreadsheet, but it's a relational database, unlimited bases, 1,200 rows/base and 1,000 API requests/month
fieldbook.com — Fieldbook lets anyone create a simple tracking database, as easily as a spreadsheet. Automatic API. Unlimited free sheets, share with unlimited users
spreadsheetdb.io - Database that can be queried with spreadsheets, 3 spreadsheets and 200 rows free

STUN, WebRTC, Web Socket Servers and Other Routers

scaledrone.com — Push messaging service. Free for up to 20 simultaneous connections and 100,000 messages/day
pusher.com — Hosted Web Sockets broker. Free for up to 20 simultaneous connections and 100,000 messages/day
stun:stun.l.google.com:19302 — Google STUN
stun:global.stun.twilio.com:3478?transport=udp — Twilio STUN
segment.com — Hub to translate and route events to other third party services. 100,000 events/month free
ngrok.com — Expose locally running servers over a tunnel to a public URL
cloudamqp.com — RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ's
meetfinch.com — Easily create SSL encrypted URLs that tunnel to your local development machine

Issue Tracking and Project Management

bitrix24.com — Free intranet and project management tool
pivotaltracker.com — Pivotal Tracker, free for public projects
atlassian.com — Free Jira etc for Open Source
kanbantool.com — Kanban board based project management. Free, paid plans with more options
kanbanflow.com — Board based project management. Free, premium version with more options
kanbanery.com — Board based project management. Free for 2 users, premium tiers with more options
zenhub.io — The only project management solution inside GitHub. Free for public repos, OSS and nonprofit organizations
trello.com — Board based project management. Free
producteev.com — Task management tool. Free, premium version with more options. Mobile applications available
fogcreek.com — Bug tracking and project management. Free for 2 users
waffle.io — Board based project management solution from your existing GitHub Issues, free for Open Source
huboard.com — Instant project management for your GitHub issues, free for Open Source
taiga.io — Project management platform for startups and agile developers, free for Open Source
jetbrains.com — Free hosted YouTrack (InCloud) for FOSS projects, private projects {free for 10 users}
github.com — In addition to its Git storage facility, GitHub offers basic issue tracking
asana.com — Free for private project with collaborators
acunote.com — Free project management and SCRUM software for up to 5 team members
gliffy.com — Online diagrams: flowchart, UML, wireframe,... Also plugins for Jira and Confluence. 5 diagrams and 2 MB free
cacoo.com — Online diagrams in real-time: flowchart, UML, network. Free max. 15 users/diagram, 25 sheets
draw.io — Online diagrams stored locally, in Google Drive, OneDrive or Dropbox. Free for all features and storage levels
leankit.com — Kanban board, that visualizes your workflow. Free up to 10 users
visualstudio.com — Unlimited free private code repositories; Tracks bugs, work items, feedback and more
testlio.com — Issue tracking, test management and beta testing platform. Free for private use
vivifyscrum.com — Free tool for Agile project management. Scrum Compatible
targetprocess.com — Visual project management, from Kanban and Scrum to almost any operational process. Free for unlimited users, up to 1,000 data entities {more details}
overv.io — Agile project management for teams who love GitHub
taskulu.com — Role based project management. Free up to 5 users. Integration with GitHub/Trello/Dropbox/Google Drive
contriber.com — Customizable project management platform, free starter plan, 5 workspaces
planitpoker.com — Free online planning poker (estimation tool)
ubertesters.com — Test platform, integration and crowdtesters, 2 projects, 5 members
jetbrains.com — search based on time tracking, attachments on Agile Board, and many other improvements. 10 users 5 GB free

Storage and Media Processing

aerofs.com — P2P file syncing, free for up to 30 users
bintray.com — Binary File storage, free for Open Source. Includes SSL, CDN and a limited number of REST calls
cloudinary.com — Image upload, powerful manipulations, storage and delivery for sites and apps, with libraries for Ruby, Python, Java, PHP, Objective-C and more. Perpetual free tier includes 7,500 images/month, 2 GB storage, 5 GB bandwidth
plot.ly — Graph and share your data. Free tier includes unlimited public files and 10 private files
transloadit.com — Handles file uploads and encoding of video, audio, images, documents. Free for Open Source and other do-gooders. Commercial applications get 1 GB free for test driving
podio.com — You can use Podio with a team of up to five people and try out the features of the Basic Plan, except users management
shrinkray.io — Free image optimization of GitHub repos
kraken.io — Image optimization for website performance as a service, free plan up to 1 MB file size
placehold.it — A quick and simple image placeholder service
placekitten.com — A quick and simple service for getting pictures of kittens for use as placeholders
embed.ly — Provides APIs for embedding media in a webpage, responsive image scaling, extracting elements from a webpage. Free for up to 5,000 URLs/month at 15 requests/second
backhub.co — Backup and archive your GitHub repositories. Free for public repos
otixo.com — Encrypt, share, copy and move all your cloud storage files from one place. Basic plan provides unlimited files transfer with 250 MB max. file size and allows 5 encrypted files
tinypng.com — API to compress and resize PNG and JPEG images, offers 500 compressions for free each month
filestack.com — File picker, transform and deliver, free for 250 files, 500 transformations and 3 GB bandwidth
packagecloud.io — Hosted Package Repositories for YUM, APT, RubyGem and PyPI. Limited free plans, open source plans available via request
image-charts.com - Unlimited image chart generation with a watermark
jsonbin.io - Free JSON data storage service, ideal for small scale web apps, website, mobile apps.

Design and UI

pixlr.com — Free online browser editor on the level of commercial ones
imagebin.ca — Pastebin for images
cloudconvert.com — Convert anything to anything. 208 supported formats including videos to gif
resizeappicon.com — A simple service to resize and manage your app icons
vectr.com — Free Design App For Web + Desktop
walkme.com — Enterprise Class Guidance and Engagement Platform, free plan 3 walk-thrus up to 5 steps/walk
marvelapp.com — Design, prototyping and collaboration, free limited for 3 projects
Zeplin — Designer and developer collaboration platform. Show designs, assets and styleguides. Free for 1 project.
figma.com — Online, collaborative design tool for teams; free tier includes unlimited files and viewers with a max of 2 editors and 3 projects

Data Visualization on Maps

geocoder.opencagedata.com — Geocoding API that aggregates OpenStreetMap and other open geo sources. 2,500 free queries/day
datamaps.co a free platform for creating visualizations with data maps
geocod.io — Geocoding via API or CSV Upload. 2,500 free queries/day
gogeo.io — Maps and geospatial services with an easy to use API and support for big data
carto.com — Create maps and geospatial APIs from your data and public data
giscloud.com — Visualize, analyze and share geo data online
latlon.io — Geocoding API + school districts, census geography divisons and other address based data. 2,500 free requests/month
mapbox.com — Maps, geospatial services and SDKs for displaying map data

Package Build System

build.opensuse.org — Package build service for multiple distros (SUSE, EL, Fedora, Debian etc.)
copr.fedoraproject.org — Mock-based RPM build service for Fedora and EL
help.launchpad.net — Ubuntu and Debian build service

IDE and Code Editing

c9.io — IDE in a browser. Incorporates an Ubuntu virtual machine and in-browser terminal access. Integrates with GitHub and BitBucket, but also adds SFTP and generic Git access
codeanywhere.com — Full IDE in the browser and mobile apps. Access FTP, SFTP, Dropbox, Google Drive, GitHub and BitBucket. Hosted virtual machines with terminal access. Collaboration features like share links, live editing, permissions and version tracking
codenvy.com — IDE and automated developer workspaces in a browser, collaborative, Git/SVN integration, build and run your app in customizable Docker-based runners (free tier includes: 4 GB RAM, always-on machines, ability to run multiple machines simultaneously), pre-integrated deploy to Google Apps
visualstudio.com — Fully-featured IDE with thousands of extensions, cross-platform app development (Microsoft extensions available for download for iOS and Android), desktop, web and cloud development, multi-language support (C#, C++, JavaScript, Python, PHP and more)
cocalc.com (formerly SageMathCloud at cloud.sagemath.com) — Collaborative calculation in the cloud. Browser access to full Ubuntu with built-in collaboration and lots of free software for mathematics, science, data science, preinstalled: Python, LaTeX, Jupyter Notebooks, SageMath, scikitlearn, etc
wakatime.com — Quantified self metrics about your coding activity, using text editor plugins, limited plan for free
apiary.io — Collaborative design API with instant API mock and generated documentation (Free for unlimited API blueprints and unlimited user with one admin account and hosted documentation)
mockable.io — Mockable is a simple configurable service to mock out RESTful API or SOAP web-services. This online service allows you to quickly define REST API or SOAP endpoints and have them return JSON or XML data
jetbrains.com — Productivity tools, IDEs and deploy tools. Free license for students, teachers, Open Source and user groups
stackhive.com — Cloud based IDE in browser that supports HTML5/CSS3/jQuery/Bootstrap
tadpoledb.com — IDE in browser Database tool. Support Amazon RDS, Apache Hive, Apache Tajo, CUBRID, MariaDB, MySQL, Oracle, SQLite, MSSQL, PostgreSQL and MongoDB databases
codepen.io — CodePen is a playground for the front end side of the web
repl.it — A cloud coding environment for various program languages
codesandbox.io — Online React playground
stackblitz.com — Online VS Code IDE for Angular & React

Analytics, Events and Statistics

analytics.google.com — Google Analytics
heapanalytics.com — Automatically captures every user action in iOS or web apps. Free for up to 5,000 visits/month
sematext.com — Free for up to 50 K actions/month, 1 day data retention, unlimited dashboards, users, etc
usabilityhub.com — Test designs and mockups on real people, track visitors. Free for one user, unlimited tests
gosquared.com — Track up to 1,000 data points for free
mixpanel.com — Free 25,000 points or 200,000 with their badge on your site
amplitude.com — 1 million monthly events, up to 2 apps
keen.io — Custom Analytics for data collection, analysis and visualization. 50,000 events/month free
metrica.yandex.com — Unlimited free analytics
hotjar.com — Per site: 2,000 pages views/day, 3 heatmaps, data stored for 3 months,...
imprace.com — Landing page analysis with suggestions to improve bounce rates. Free 5 landing pages/domain
baremetrics.com — Analytics and Insights for stripe
optimizely.com — A/B Testing solution, free starter plan, 1 website, 1 iOS and 1 Android app
expensify.com — Expense reporting, free personal reporting approval workflow
ironSource atom — Atom Data Flow Management is a data pipeline solution, 10 million monthly events free
botan.io — Free analytics for your Telegram bot

Visitor Session Recording

inspectlet.com — 100 sessions/month free for 1 website
mousestats.com — 100 sessions/month free for 1 website
hotjar.com — Per site: 2,000 pages views/day, 3 heatmaps, data stored for 3 months,...
getWisdom.io — 100 visitors/month, with unlimited page views, domains, and live-view.
usersurge.com — 250K sessions per month for individuals.

International Mobile Number Verification API and SDK

cognalys.com — Freemium mobile number verification through an innovative and reliable method than using SMS gateway. Free 10 tries and 15 verifications/day
numverify.com — Global phone number validation and lookup JSON API. 250 API requests/month
sumome.com — Heat map and conversion enhancement tools, free without few advanced features

Payment / Billing Integration

braintreepayments.com — Credit Card, Paypal, Venmo, Bitcoin, Apple Pay,... integration. Single and Recurrent Payments. First USD 50,000 free
taxratesapi.avalara.com — Get the right sales tax rates to charge for the close to 10,000 sales tax jurisdictions in the USA. Free REST API. Registration required
currencylayer.com — Reliable Exchange Rates and Currency Conversion for your Business, 1,000 API requests/month free
vatlayer.com — Instant VAT number validation and EU VAT rates API, free 100 API requests/month
[fraudlabspro.com] (https://www.fraudlabspro.com) - Help merchants to prevent payment fraud and chargebacks. Free Micro Plan available with 500 queries/month.

Docker Related

Arukas Cloud — Free docker container hosting, 10 during beta period, 3 afterwards (Japanese)
Docker Cloud — Manages the deployments of Docker containers to your (separate) cloud environment with one free repository
Docker Hub — One free private repository and unlimited public repositories to build and store Docker images
quay.io — Build and store container images with unlimited free public repositories
canister.io — 20 free private repositories for developers, 30 free private repositories for teams to build and store Docker images
Whales - A tool to automatically dockerize your applications for free.

Vagrant Related

atlas.hashicorp.com — HashiCorp's index of boxes
vagrantbox.es — An alternative public box index

Miscellaneous

apichangelog.com — Subscribe to be notified each time API Documentation is updated (Facebook, Twitter, Google,...)
docsapp.io — Easiest way to publish documentation, free for Open Source
instadiff.com — Compare website versions with highlighted changes before you deploy, free for 100 pages/month
fullcontact.com — Help your users know more about their contacts by adding social profile into your app. 500 free Person API matches/month
formlets.com — Online forms, unlimited single page forms/month, 100 submissions/month, email notifications
superfeedr.com — Real-time PubSubHubbub compliant feeds, export, analytics. Free with less customization
screenshotlayer.com — Capture highly customizable snapshots of any website. Free 100 snapshots/month
screenshotmachine.com — Capture 100 snapshots/month, png, gif and jpg, including full-length captures, not only home page
readme.io — Beautiful documentations made easy, free for Open Source
formaholic.com — Simple form endpoint. Perfect for static sites
http2.pro — HTTP/2 protocol readiness test and client HTTP/2 support detection API.

APIs, Data and ML

dreamfactory.com — Open source REST API backend for mobile, web, and IoT applications. Hook up any SQL/NoSQL database, file storage system, or external service and it instantly creates a comprehensive REST API platform with live documentation, user management,...
monkeylearn.com — Text analysis with machine learning, free 100,000 queries/month
wit.ai — NLP for developers
wolfram.com — Built-in knowledge based algorithms in the cloud
parsehub.com — Extract data from dynamic sites, turn dynamic websites into APIs, 5 projects free
import.io — Easily turn websites into APIs, completely free for life
wrapapi.com — Turn any website into a parameterized API
algorithmia.com — Host algorithms for free. Includes free monthly allowance for running algorithms. Now with CLI support
bigml.com — Hosted machine learning algorithms. Unlimited free tasks for development, limit of 16 MB data/task
mashape.com — API Marketplace and powerful tools for private and public APIs. With the free tier, some features are limited such as monitoring, alerting and support
dominodatalab.com — Data science with support for Python, R, Spark, Hadoop, Matlab and others
havenondemand.com — APIs for machine learning
restlet.com — APISpark enables any API, application or data owner to become an API provider in minutes via an intuitive browser interface
scrapinghub.com — Data scraping with visual interface and plugins. Free plan includes unlimited scraping on a shared server
context.io — Create simple email webhooks and code against a free, RESTful, imap API to leverage email data
cloudrail.com — API integration solution. Unified interfaces for multiple web APIs, API change management

Other Free Resources

github.com - FOSS for Dev — A hub of free and Open Source software for developers
github.com - Free for nonprofit — List of free services for nonprofit organizations
getawesomeness — Retrieve all amazing awesomeness from GitHub... a must see
education.github.com — Collection of free services for students. Registration required

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