Invictus

StepMania is a free/open source rhythm video game for Windows, Mac, and Linux created by Chris Danford. It was originally developed as a simulator of Konami's popular arcade and console video game series, Dance Dance Revolution, and has since evolved into an extensible rhythm game engine capable of supporting a wide variety of rhythm-based game types.

Street Legal Racing: Redline is the sequel to Street Legal. You start out as a rookie with $20,000 to buy a vehicle, tweak it, and compete in illegal races for more money. The car building component has a great amount of detail, featuring 100 interchangable parts down to the crankshaft and pistons, and custom paint jobs with brushes and stickers.