Khan Academy — iTunes — Free
For those of you that are not aware, Khan Academy is a free online resourcing for learning, well, just about anything:
With a library of over 2,800 videos covering everything from arithmetic to physics, finance, and history and 298 practice exercises, we're on a mission to help you learn what you want, when you want, at your own pace.
It was started by a true genius by the name of Salman Khan with the goal of revolutionizing and fixing the problems with education today. I really suggest you watch this video to get a better idea of what this is all about. It's truly enlightening.
Not only has Khan Academy become the place to go to for really just about anyone who wants to learn something they feel they need to know, but it is also a huge help for students across the world — myself, sometimes, included. It's really a truly incredible resource that you should be taking advantage of.
On that note, it's now even easier than ever to do so, because — with the recent enhancements to iTunes U — Khan Academy is now available for free download to any of your iOS devices.