Frets on Fire
Frets on Fire was created as an entry to the Assembly 2006 Game Development Competition by Unreal Voodoo and it placed first in the competition. The game tests your musical skills and the speed of your fingers in a similar way to the very popular Guitar Hero games do, but instead of forcing you to buy the guitar controllers, the game & the console, it lets you play your favorite tunes free using your keyboard and your home computer (and it is available for PC, Mac & Linux). Of course if you would like to, you can also use the guitar controllers or generic joysticks.