Started as a mod to Frets On Fire, FoFiX is recognized now as a fork to the original boasting high amounts of customizability, improved stability, and plenty of new features. You can jam to songs with actual controllers from the Guitar Hero or Rockband games, or you can just use your keyboard. Plenty of charts can be found on the internet that are compatible with FoF, but only FoFiX can play the drums and vocal sections (if present).
Our latest stable version is 3.121.
Version 4.0 is in development and already has tons of improvements including improved performance and the ability to make your own setlists and rockmeters.