StepMania (OS X) for Mac
Publisher's Description
From StepMania:
StepMania is capable of playing many game types. Currently, it supports games similar to Dance Dance Revolution, Pump It Up, EZ 2 Dancer, and Para Para Paradise. In the future, it will support games similar to BeatMania, Guitar Freaks, and DrumMania. The games played by StepMania are rhythm games. Notes scroll up from the bottom of the screen, and the player must hit the corresponding button on the controller. All games can be played using the keyboard, but the real fun comes when using specially designed controllers, such as a dance pad or hand sensors.
