Chessboard vision: https://egorblagov.github.io/chess-board-vision/
Chess Color Squares: https://www.chessvideos.tv/chess-visualizer-square-colors.php
Blindfold Chess: https://www.jimmyrustles.com/chess
https://chessinsights.org/blindfold/
Human-like Chess Bot: https://www.maiachess.com/
Position/Opening Search: https://www.chesspublishing.com/content/search-position.htm
“Nalimov” Endgame tablebases
https://syzygy-tables.info/