iBook & iTunesU
Mac OS X
November 2013 News: iPad Air, Explain Everything 2.25 (iPad) and EE for Android 1.1 now available.
iPad Air audio recording bug and slide content disappearing bug have both been addressed in version 2.25.
iTunes/App Store Page
(buy the app for $2.99 USD, rate and review it too please!)
Apple Education Volume Purchase Pricing
($1.49 per copy for >20 copies - available to members of Apple's VPP)
Explain Everything for Android
Explain Everything Compressor for Mac
Explain Everything Player for Mac
(please report any problems or suggestions for improvement here)