A Directory of Haskell Libraries

Overview

This is a categorized and annotated directory of available Haskell libraries. This directory is not comprehensive and highly opinionated.

Benchmarking

criterion: statistically accurate benchmarking

Concurrency and Parallelism

async: higher-level interface over threads, providing e.g. futures

Data Stores

Relational Databases

mysql-simple: a mid-level client library for the MySQL database

Riak

riak: automated storage and conflict resolution

Data Structures and Algorithms

Unicode Strings

text: representation for Unicode strings, including I/O support.
text-icu: ICU support

Byte Strings

bytestring: representation for byte strings, including functions for passing byte strings to C code and I/O support.

Maps, Sets, Sequences, Graphs, and Trees

containers: standard immutable data structures

HashMaps and HashSets

hashable: type class for data types that can be cached
unordered-containers: hashing-based containers that are typically faster than their ordered counterparts

Vectors

vector: boxed and unboxed vectors
vector-algorithms: several different sort algorithms for vectors

Math

mwc-random: fast random number generation
statistics: comprehensive statistics library

Monads

mtl: monads and monad transformers

Monitoring

ekg: remote monitoring over HTTP

Networking

network: socket and low-level networking support.

Serialization

Binary Formats

binary: parser and generate arbitrary byte formats

CSV

cassava: convert CSV files to/from Haskell data types

JSON

aeson: parser/serializer to/from Haskell data types

Text Formats

attoparsec: parser combinator library for creating parser for text formats or mixed binary/text formats, such as HTTP.
base16-bytestring: base16 encoding/decoding
base64-bytestring: base64 encoding/decoding

Testing

QuickCheck: random testing of program properties (preferred method)
HUnit: a unit testing framework for Haskell, inspired by the JUnit tool for Java
test-framework: framework for grouping, running, and displaying the output of tests
test-framework-quickcheck2: test-framework test runner for QuickCheck
test-framework-hunit: test-framework test runner for HUnit