Unicon Inc, http://www.unicon.net/ http://www.unicon.net/, partly does this. They cater to higher education with software like uPortal, CAS, and uMobile. All

Unicon Inc, http://www.unicon.net/ http://www.unicon.net/, partly does this. They cater to higher education with software like uPortal, CAS, and uMobile. All of these software products are open source, but they make money off of a support model like this. Universities that pay them for support can vote on features that they want worked on. I do not work for them, but my employer does use them for our student portal.