Chessagine

A solid bridge to the chess analysis ecosystem. You get Stockfish, Leela, and Maia engines for position evaluation, plus direct access to Lichess for games, puzzles, opening stats, and study collections. It also taps into specialized databases like ChessDB and ChessBoardMagic for correspondence games, TCEC matches, and repertoire data. Usage logs show heavy reliance on Lichess game fetching and puzzle retrieval, with board rendering and PGN viewers for visualization. Reach for this when you're building chess coaching tools, analysis interfaces, or anything that needs to crunch positions and pull real game data without cobbling together multiple API clients yourself.