Sick of waiting for Guitar Hero 2? From Freetar:
The video above shows the Freetar editor in use. This is the first of a two-part project to create a totally FREE PC rhythm based game that you can use any game pad with. Including guitar-shaped ones. Create and play your own songs, the way YOU want.
The beta version of the editor will be released to the public soon, with the game portion a little later on.