Tools that use audio.
Paid iPad app: http://itunes.apple.com/app/wolfram-music-theory-course/id410595605?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/app/wolfram-music-theory-course/id410595605?mt=8&uo=4&at=10l6SU
Paid Mac program: http://itunes.apple.com/us/app/logic-pro/id459578486?mt=12&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/momos-learning-japanese/id383100236?mt=8&uo=4&at=10l6SU
Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=3442+17116012818275486668
Website: http://advanced.aviary.com/tools/audio-editor
Website: https://www.smartmusic.com/
Free iPad app: https://itunes.apple.com/us/app/id1114202174?mt=8&at=10l6SU
Free Mac program: http://audacity.sourceforge.net/download/
Free Windows program: http://audacity.sourceforge.net/download/
Paid iPad app: https://itunes.apple.com/us/app/pianist-pro/id358857758?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/app/pianist/id284622652?mt=8&uo=4&at=10l6SU
Website: http://edu.musicshake.com/?r=edshelf
Website: http://www.recordmp3.org/
Free Android Phone app: https://play.google.com/store/apps/details?id=fm.audioboo.application
Free iPad app: http://itunes.apple.com/app/audioboo/id305204540?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/app/audioboo/id305204540?mt=8&uo=4&at=10l6SU
Website: http://audioboo.fm/