StepMania is an open source program meant to simulate many BEMANI games, particularly DanceDanceRevolution. It is also the program that in the groove and PUMP IT UP PRO are built off of, with the development staff for those games including many of the programmers from StepMania. The widely used versions are the 3.9 vanilla (and its 3.9+ addon), AMX (includes support for Cover Flow songlists), 5.0 alpha, sm-ssc (a fork of the game engine made by a group of Stepmania programmers called Spinal Shark Collective) and openITG.