I am a big proponent of life long learning as most everyone knows. Further, I am a big proponent of unless needed otherwise, mostly learning at ones on pace. And best option of all, free education is by far the best, especially if it is of a high quality level. This is where edX.org (note the .org, not .com) comes into the picture.
edX.org is a site I have used for a little bit and I can highly recommend it to everyone, especially those in the technology fields. How does it work? Basically, as I understand, big colleges and universities offer some classes on the site – along with a few other educational types of places. Most all classes are offered with a small fee, which will lead to a certificate of completion in most cases, or as an audit for free.
Like I said, unless you specifically need to show you have completed the course, audit them – as many as you wish from what I can tell.
Course range the gambit, but do tend to focus on the technology sciences more. I have seen course ranging from nutrition to psychology, with leadership and of course all manner of programming and such in between. And these are legit university level course in a cases – including such esteemed halls as Havard and MIT for example.
I personally recommend the Intro to Linux class, offered by the Linux Foundation – even if you have been using Linux for years. I assure you that you will pick a few things up out of the class with just the audit option.
** – Image is from edX for the Intro to Linux course.