SpiderOak provides an easy, secure and consolidated free online backup, sync, sharing, access & storage solution for Windows, Mac OS X, and Linux (Ubuntu, Debian, Fedora & openSUSE)
"twiducate.com is a free resource for educators. Developed in 2009, our goal is to create a medium for teachers and students to continue their learning outside the classroom. We attempt to fill a need for a more educationally focused, safe venue for teachers, schools, and home learners in a social networking environment. "