Some of my colleagues, including Michel Sénécal et Jean Robillard, have begun using SPIP to develop online courses. I didn’t know the first thing about SPIP and it seems to have a strong “non-anglocentric flavor” (it comes from France) which might explain why I didn’t know about it. It is a free PHP-based Content Management Platform fairly similar to Plone though it seems more versatile than Plone.
From the SPIP web site:
SPIP is a publishing system developed by the minirézo to manage the site uZine. We provide it to anyone as a free software under GPL license. Therefore, you can use it freely for your own site, be it personnal, co-operative, institutional or commercial.
I actually think I will give it a try the next time I develop an online course.
Update: I’m disappointed that SPIP doesn’t seem to generate valid XHTML. It seems to be a recurring problem, but there are some (difficult) workarounds.