michael1241/discotron Discord integration for Patron status (Python).

ornicar/lichess-puzzler Generate, review and classify chess puzzles (Python, TypeScript).

cyanfish/bbpPairings Swiss pairings (C++).

lichess-org/lila-pwned Query database of known leaked passwords (Rust).

lichess-org/lila-ip2proxy Query database of known proxy IPs (Rust).

clarkerubber/irwin AI that learns cheating patterns to help mods (Python).

lichess-org/kaladin Machine Learning tool aimed at automating cheat detection using Insights.

lichess-org/external-engine External chess engine provider for the analysis board (Python).

lichess-org/lila-engine Broker for communication between external engine providers and clients (Rust).

lichess-org/lila-gif GIF generator for games and positions (Rust).

lichess-org/fishnet Distributed computer analysis, using official-stockfish/Stockfish and ianfab/Fairy-Stockfish, a Stockfish fork with chess variant support (Rust, C++).

lichess-org/lila-push Web Push service (Rust).

lichess-org/lila-tablebase Tablebase (Rust).

lichess-org/lila-openingexplorer (Rust).

lichess-org/lila-search Search engine (Scala).

lichess-org/lila-fishnet Fishnet move requests (Scala).

lichess-org/lila-ws WebSocket traffic (Scala).

lichess-org/pgn-viewer Embedded client-side PGN viewer.lichess-org/stockfish.wasm, lichess-org/stockfish.js Slower fallback versions of Stockfish for browsers (C++, WebAssembly, JavaScript).hi-ogawa/Stockfish Stockfish compiled for cutting-edge browsers (C++, WebAssembly, JavaScript).lichess-org/chessground Frontend chess board (TypeScript).

lichess-org/compression Compression algorithms for chess moves and clocks (Java).lichess-org/scalachess Rules of chess and its variants (Scala).lichess-org/lila ui Frontend modules (TypeScript, Sass).lichess-org/lila modules Backend modules (Scala).lichess-org/lila Main backend and frontend (Scala).You can download, read, use and modify every bit of source code. Lichess is free/libre open source software.

Chess game in java source code