Online learning has reached a peak with people who which to learn from the comfort of their own home or office. There are quite a few sites on the web that offer single classes all the way up to full college level courses. Here are a few.
Coursera – One of the most generous of the online university-level offerings on the web. Classes from world-renowned universities are open for all to participate. Classes can involve lectures, group study and more.
Udacity – Their mission is to bring accessible, affordable, engaging, and highly effective higher education to the world. I’d say that was a worthy goal.
Open 2 Study – Offering course on Agriculture, Astronomy , Physics and much more. Based in Australia.