CK-12 Foundation
http://www.ck12.org/teacher/?gclid=CKzmuumSmbYCFdGd4AodBlwAAQ
CNET Educational Software
http://download.cnet.com/windows/educational-software/
Educational Freeware
http://www.educational-freeware.com/freeware/
http://www.ck12.org/teacher/?gclid=CKzmuumSmbYCFdGd4AodBlwAAQ
CNET Educational Software
http://download.cnet.com/windows/educational-software/
Educational Freeware
http://www.educational-freeware.com/freeware/
Owl & Mouse
SchoolForge.net
Sheppard Software