I have written a few small mostly free or open source games over the years:
• Still Yet Another Sokoban An open source implementation of the popular puzzle game, in which the goal is to push the crates onto the designated squares without getting stuck.
• Falling Blocks A game based on something resembling Tetris(TM) but in no way is it Tetris(TM).
• Dave Gnukem A retro-style game that could perhaps be thought of as a parody (albeit not a very funny one) of the famous 1991 DOS classic, Duke Nukem 1. It is open source (C++) and cross-platform. It has a github repo. Download Latest Release »