Class Central is a search engine for online courses. Learners can search for their topic of interest and also read reviews of courses to help them decide which courses to try.
Dhawal Shah set the site up in late 2011 when several universities began making courses available online for free. Dhawal wanted to list the courses so he and others could keep track of when they were available. Now, thousands of courses are listed.
You can create a free account to make your personal collection of courses and write reviews. Just to be clear, Class Central is not involved in the running of the courses.