Music Racer (not percussion yet)
http://www.daveconservatoire.org/
http://www.beginningbandbootcamp.com/
**MusicTheory.net - One-stop-shop for lessons and exercises, and it's fun
*Teoria - Pretty much anything you need for ear training
*Children's Music Workshop - Good note and ear interval trainers, also has lessons
*The Music Interactive - Fun games like Staff Wars
Easy Ear Training - A number of articles on different areas of ear training and learning to listen
*Music Tech Teacher - Games, quizzes, worksheets
Earstudio Do Re Mi (for chrome)
Earstudio Rhythm (for chrome)
Interval Tutor - Listen to intervals how you want. Includes links to songs that use the intervals
Ear Master - Songs using certain intervals
Piano Intervals - Good design, only uses piano keys for intervals, and free version only goes up to P4
Aruffo - costs $$$
**Audio Check - Train for slight dB and Htz changes
Mr. Soundman - Download for learning frequencies
Moulton Labs - For Recording Engineers and Producers to learn frequencies and effects (costs $$$)