chess-tools

NautilusChess is a lightweight Python chess bot with a GUI, screen-based move recognition, and Minimax logic. It plays on platforms like Lichess and Chess.com using pixel-level board tracking, and supports external chess engines and opening books.

Free, no-signup chess diagram generator. Paste a FEN, customize the board, and export high-resolution PNG, JPEG, or SVG — runs entirely in your browser, privacy-first. Open source.

CLI tool to merge PGN chess game files into one database. Combine Lichess, Chess.com and tournament PGNs fast.

A Chess.com client for connecting UCI-compatible four-player chess engines.

OCN — Open Chess Naming. Hierarchical names for chess openings, designed as a human-friendly companion to ECO.

AI chess analysis assistant that suggests the best move with a plain-English explanation on Chess.com and Lichess. Chrome extension + web tools for any position. https://chesshelper.ai

Windows tool for filtering and cleaning large PGN chess-game collections by Elo, game length and time control.

Convert chess.com live game URLs into lichess analysis links (PGN extraction + CLI/TUI).

Educational Chess.com Chrome extension with local Stockfish 18 analysis, move suggestions, and board arrows.

Chess resources and tools