lichess-org/lila

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

⭐ 17880 | 🍴 2581

official-stockfish/Stockfish

A free and strong UCI chess engine

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jhlywa/chess.js

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

⭐ 4272 | 🍴 978

thomasahle/sunfish

Sunfish: a Python Chess Engine in 111 lines of code

⭐ 3207 | 🍴 577