DApps

MuesliSwap Onchain Governance - A complete governance system, including tallies, treasury and sample upgradeable contracts
STEAK Protocol - A proof of stake based chain to provide provably random hashes for smart contract.
Teddy Swap uADA - A wrapped ADA token for decentralizing liquidity pool stake
T Minus One - A fungible token creator dashboard, mint, vest, sell, etc
Kalyx - dCFD trading for ADA/USD on Cardano
onchain-token-verification by MuesliSwap - A framework for logging verification metadata and trusters on chain built with OpShin
nescrow.xyz - An entire market place built with OpShin and PyCardano by @while0x1
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Tutorials

opshin-pioneer-program - A comprehensive set of educational examples, based on the Plutus Pioneer Program
[WIP] Gimbalabs PBL 2023 - A step by step guide featuring various Smart Contract Languages, also featuring OpShin (WIP)
[WIP] The OpShin Book - A comprehensive guide introducing to OpShin

Vesting & Oracle Example - Using a Vesting contract together with a permissioned Oracle by @cardano-apexpool
opshin/examples - The standard OpShin Examples
opshin-starter-kit - Basic repository for starting on Demeter.run

Developing Smart Contracts with OpShin & PyCardano - A comprehensive introduction to OpShin as part of the PPP
Emurgo Academy Workshop on OpShin - A presentation of OpShin with collaborative coding
Interview with OpShin at Learn Cardano - An informal interview and introduction to OpShin
OpShin at the European Townhall - Very quick introduction to Smart Contract writing with OpShin
OpShin @ AdaPulse - A longer form interview during the earlier phase of OpShin

opshin.std - A library with yet-to-be-determined standard functions, math, fractions etc.
opshin.ledger - The opshin definitions of the Plutus Ledger API

PyCardano - The off-chain library compatible with OpShin
Ecosystem Overview - A comprehensive overview on Programming Languages for Smart Contracts on Cardano
hebi - the small sister project of opshin with significantly improved performance (at the cost of more restrictiveness)
plutus-bench - a comprehensive unified framework to compare the performance of Smart Contract languages
uplc - a python package for manipulating Untyped Plutus Language Core
plutonomy-cli - a general purpose smart contract optimizer