♞ lichess.org: the forever free, adless and open source chess server ♞

A free and strong UCI chess engine

A TypeScript chess library for chess move generation/validation, piece placement/movement, and check/checkmate/draw detection

Sunfish: a Python Chess Engine in 111 lines of code

A chess library for Python, with move generation and validation, PGN parsing and writing, Polyglot opening book reading, Gaviota tablebase probing, Syzygy tablebase probing, and UCI/XBoard engine communication

Chess reinforcement learning by AlphaGo Zero methods.

lichess.org mobile application

The Turn Based Strategy Game/eSport. Master your beasts! 🐺

Effortlessly transmitting Morse Code of chess moves to your butthole 💝

Lichess mobile app v2

Distributed Java game server, including cluster management server, gateway server, hall server, game logic server, background monitoring server and a running web version of fishing. State machine, behavior tree, A* pathfinding, navigation mesh and other AI tools

Mobile/Web chess UI for lichess.org

Maia is a human-like neural network chess engine trained on millions of human games.

Play chess in your terminal

A bridge between Lichess bots and chess engines

Distributed Stockfish analysis for lichess.org

PyChess - a chess client for Linux/Windows

Chess API written in scala. Immutable and free of side effects.

The Ultimate Chess Toolkit

chess variant engine supporting Xiangqi, Shogi, Janggi, Makruk, S-Chess, Crazyhouse, Bughouse, and many more