I found a few of these to be interesting...and free. Most have to do with education. FWIW Check them out.
American History
http://memorialhall.mass.edu/home.html
create a timeline
http://www.timetoast.com/
used cpus for education
http://computersforlearning.gov/
Free computer cloning project
http://www.fogproject.org/
Create effective online learning sites
http://moodle.org
Open Source BB software
http://www.phpbb.com/
Large scale open source
http://revolutionlinux.com
an online classroom communications tool for teachers and students
http://edmodo.com
Safe teacher/student texting
https://gaggle.net/
World's Largest K-12 Learning Network!
http://www.epals.com/






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