I posted a message to the TALO (Teach and Learn Online) google group to see if they could help with our request for open source and free software to benefit students with disabilities. Chris Harvey posted some great links, which I've added to our Wiki.
Chris also mentioned that he read through our seminar and pointed out that Richard Stallman was the founder of free software, and not opensource/freedomware. Here's a link to the thread in TALO. Chris also provided links to Wikipedia's definition of free software and free software movement which I also added to our Wiki.
I'll have to carefully read all these definitions to get it sorted out in my head.
BTW TALO list is a great way to keep up-to-date on how educators are using software in their own practice, and generally on current issues in education.