Android: Coursera has always been one of our favourite sources of free online education. Now, the company has released its own Android app that, among other things, allows you to download lectures for offline listening.
The app can keep track of all the courses you've currently enrolled in, stream lectures, or download them locally. You'll still need to get on your regular computer to do homework and turn in assignments, but the app should help save some time by studying on your commute or while you work out.
Coursera [Google Play Store]