FutureLearn before, but I thought I'd do it now since I just signed up for some classes with them.
FutureLearn offers free, online classes covering a wide array of subjects. I signed up for The Science of Nutrition, Nutrition and Well-Being, and Antiquities Trafficking & Art Crimes. Other classes cover science, history and the arts. Classes are a combination of videos, text and quizzes, and run for a short period of time, usually three to six weeks. For the money (or lack of it) the classes are well worth your time.