Hey guys, here's something from my bookmarks that might be useful to you:
As the title says, it's a giant list of free online courses that deal with AP exam prep. Some AP subjects are missing, but most that I'm planning on taking are here (including Psych, US Gov, Biology, Calc AB).
So far, I've tried a couple of the AP Biology modules from edX & Rice University. My verdict: It's been really helpful for my studying. There's nothing new that my AP bio teacher hasn't presented yet, per se, but it's nice to see someone else present the information. Also, it beats doing a second re-read of my textbook / doing another set of practice Q's. The only downside is that the course isn't in session right now, so the discussion forums are kinda dead.
I'm feeling pretty good about Psych and US Gov right now, but I'll probably do a few Calc AB modules to brush up.
Hopefully this is helpful to someone :)