Available to IEEE Computer Society members are hundreds of courses in technical subjects. A membership is relatively inexpensive, but I have not yet had a chance to evaluate the course content. I am also curious about the platform that is used to deliver these. More information is available here.

Technical resources are plentiful on the Web and much of it goes out-of-date quickly with many of these subjects, so whether these are current and relevant is questionable. But, my experience with their printed materials is that they are well done and worth the time and minimal expense.