Learn at Your Own Pace

Academic Earth - Free academic college courses.

CK-12 - Dedicated to increasing access to high quality educational materials for K-12 students all over the world. 

Khan Academy - Free world-class K-12+ education for anyone, anywhere. 

MIT OpenCourseWare - Free lecture notes, exams, and videos from MIT. No registration required.

OASIS - OASIS is a search tool that aims to make the discovery of open content easier, including textbooks, courses, primary sources and more.

Saylor Academy - Learn new skills or earn credit towards a degree - at your own pace, with no deadlines.