HarvardX - free classes (if you audit them)
These are awesome online classes. The first one that caught me was CS50 which is a tremendous in depth overview of Computer Science — really a very impressive class even if you are an old salt.
Today I got an email about a new series of classes they are offering. The Shakespeare classes have pulled me in but I would love to take them all. https://mail.google.com/mail/u/0/#inbox/WhctKJVRGBLMRTZHmfNQzKlnnCwGblnLXRfRrFnlBGTjwspPwlNFjFLQMnXcTxdlrNfjDDL
If you have time, these are worth it.