GuitarsOnFire is a GuitarHero clone, like Guitarfun and FretsOnFire. It uses FretsOnFire compatible songs, which can be found all over the internet. Everything is released under GPL.

Changes:

New Features:
Freestyle mode (Special thanks to WaxyPumpkin72 for the sound effects)
New difficulty/instrument selection menus
Online score list, see http://daid.mine.nu/guitarsonfire/
New results screen after playing a song
Much requested volume settings
Low battery warning icon during gameplay. And auto pause if a controller disconnects.
Restart option in pause menu
Samba share option (see readme.txt)

Bugfixes/changes:
Some audio fixes to make more songs playable
Many small things in the menus, larger texts, better fitting texts.
Loading is a bit faster now, and no longer speeds up at 90%.

http://wiibrew.org/wiki/GuitarsOnFire