Here's my list of online learning communities with free courses in just about everything (from the resource section of Recordkeeping for Unschoolers).
- CosmoLearning - A free educational website for students and teachers.
- Khan Academy - Learn almost anything for free.
- Wikispaces for Educators - Create your own wikis or work collaboratively with others.
- Connexions - Share expertise and experience in the form of online courses.
- Zero-Tuition College - Online community of self-directed learners.
- Wikiversity - Set learning free, preschool to university.
- MIT Open Courseware - Free courses, lecture notes, exams, and videos from the Massachusetts Institute of Technology.