There are 4 repositories under chess-cheat topic.
Advanced Chess Assistance System (Chess Cheat) for Chess.com, Lichess.org, Pychess.org and more. Hassle-free 1-click install, no downloading. All devices and browsers supported.
Runs a WASM Stockfish in your chess.com games. Displays the best moves (up to 3) and evaluation for the current board.
Able to give the best move by stockfish from a live chess.com game. Basically a Chess Cheat.
This article depicts how to detect blatant cheating in chess using computer engines.
open-source python chess hack