But GeorgeS, if you look at the listing at that site:

Courses offered:

Tufts: 1
Sofia: 1
USU: 1
Johns Hopkins: 2
MIT: 94

The results are somewhat biased by the use of the software "selected" by MIT for interagency listings, when they proposed that this was "something good to do."

As a result, this site is unlikely to find the numerous free course offerings that come from "independent" sources, but does indicate that a few other instituitions (who initially said "it can't be done") are beginning to stick a toe in the water.

I do look for lots more within "this system."

There are other places that offer something similar, but many others don't follow the systematic "rules" you should find here, to make sure that what's posted actually offers a coherent and relatively complete display of the courses.

Some of the others could be expected to expand what they now offer, but there's been some quibbling about "damn it's a lot of work" to get a GOOD course description, that's actually useful for independent study, posted.

John