A free and strong UCI chess engine

lichess.org mobile application

UCI xiangqi engine

Distributed Stockfish analysis for lichess.org

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

Beautiful, powerful chess app for the Mac

Stockfish NNUE (Chess evaluation) trainer in Pytorch

Integrates the Stockfish chess engine with Python

WebAssembly port of the strong chess engine Stockfish

The strong open source chess engine Stockfish compiled to JavaScript and WebAssembly using Emscripten

Sanmill is an open-source, UCI-like Mill/Morris/Merrills/Mühle/Malom (and its variants) program with CUI, Flutter GUI and Qt GUI, sharing and freely distributing the code, tools and data needed to deliver this mill game. We do this because we are convinced that open software and open data are key ingredients to make rapid progress.

Generate chess puzzles / tactics from a pgn file

Chess Endgame Training: app to practice a variety of well organized set of chess endgames. From elementary to the most complex endgames, you can practice until you learn how to face all of them.

Using engines running outside of the browser on https://lichess.org/analysis

棋路 Lite 版本，支持多种象棋引擎

A bot for chess.com and lichess.org that automatically plays chess for you

Creates chess puzzles from chess games and positions

An R package to read, write, create and explore chess games

Converting real images of a chessboard to FEN codes.

Responsive chess web GUI to play against the Stockfish 16 chess engine. Multiple web GUI implementations have also been included.