Free Mac program: http://audacity.sourceforge.net/download/
Free Windows program: http://audacity.sourceforge.net/download/
Google Chrome app: https://chrome.google.com/webstore/detail/gajclnhcflhoicggnpmgkedchldikjgn
Free iPad app: http://itunes.apple.com/us/app/voicethread/id465159110?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/voicethread/id465159110?mt=8&uo=4&at=10l6SU
Website: http://voicethread.com/
Paid iPad app: https://itunes.apple.com/us/app/soundnote/id364789577?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/audio-notebook-all-day-sound/id720435172?mt=8&uo=4&at=10l6SU