1. Python ChessA 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
3. FishnetDistributed Stockfish analysis for lichess.org
4. rust-pgn-readerFast non-allocating and streaming reader for chess games in PGN notation
7. lila-gifWebservice to render Gifs of chess positions and games, and stream them frame by frame
8. indexed.pyA Python dictionary that is indexed by insertion order
9. chessopsChess and chess variant rules and operations in TypeScript
16. lila-openingexplorerOpening explorer for lichess.org that can handle all the variants and billions of unique positions