Comment Connexions (Score 1) 95
Connexions (http://cnx.org) is a project for open source book material that is designed to enable teachers to "mix & match" books that are then printed on demand.
There are 2336 hits for "computer" in the catalog. No idea if any of that is useful to you.
http://cnx.org/content/search?target=&words=computer&allterms=weakAND&search=Go
There is also content on "open source in education":
http://cnx.org/lenses/rgardler/foss