The ultimate back to school guide to open source for teachers: 
Public education has always been a core value in my family. It was instilled in me from a young age that everybody deserves fair access to high-quality education. This virtue continues to influence me as I raise children of my own, one of whom will be entering kindergarten this fall. Open source is the perfect match for public education.
read more: Opensource.com lauren-pritchett
Supporting Open Source.
Have you tried: Diving with Sharks?