Board Games in Java - Chess, Checkers, etc in one application.
Here's an all-in-one board game application I built over quarantine. It contains Chess, Checkers (Draughts), Horde Chess and Knight's Tour. It uses the MVC (Model-view-controller) pattern in its design and JavaFX for the GUI. It's very easy to extend and add new games too and the GUI could quite easily be switched to Swing if need be. The computer uses the Minimax algorithm and you can have computer vs computer play.