OP covered some of the best examples, but the more complete list of commercial video games with available source code can be found here: https://en.wikipedia.o

OP covered some of the best examples, but the more complete list of commercial video games with available source code can be found here: https://en.wikipedia.org/wiki/List_of_commercial_video_games_with_available_source_code https://en.wikipedia.org/wiki/List_of_commercial_video_games... Spelunky was released as freeware so I'm not sure it counts.