I know of Khan Academy. I talked about a bit on Murray's World in 2012 I think but no one said much about it so I didn't want to go on about it. Bill Gates is well into it as I believe he's one of the primary resources/donators. I listened to some of Salman Khan's lectures on youtube. Very good stuff. Salman is doing a world of good out there with no costs.
I had heard about Khan Academy a long time ago, but it was from teachers. I got the impression that it was a tool for them and K-12 students. I didn't realize that anyone could use it as a learning tool.
It has such a wonderful set up. I introduced my son to it, and even he thought it was cool.
Yes, it's wonderful. But he does get a lot of slack for being Muslim. Ignorant people say things like 'Muslims can't be trusted' and far worse so that's the sad part even when he's actually helping American education in a big way and around the globe. They only harp on who bombed for weeks and months and overlook these good deeds.