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http://www.wikispaces.com/ Class schedules, homework assignments, notices for parents, and showcases of student work can all be online in minutes — in an educational wiki as public or private as you want it to be. A Wikispaces Private Label Education site for your school or district provides the support teachers need to spend more time with their students and less time wrestling with their tools. With unlimited wikis and powerful central administration, Wikispaces Private Label Education is a natural extension of your university. It is flexible, integrated, global, and easy to use. A wiki is a space on the Web where you can share work and ideas, pictures and links, videos and media — and anything else you can think of.

Collaboration with Ownership - current

http://www.cynapse.com/cynin/editions-and-pricing

Free Open Source Community Edition - Cyn.in: Enterprise 2.0 Coll

Cyn.in is available in three different editions, each with its own unique delivery model and packages. All editions have the entire application feature set of Cyn.in and vary in the infrastructural capabilities and support options. All Cyn.in editions have unrestricted user creation and do not require any additional client access licenses. Cyn.in on premise appliance is an integrated software appliance that lets enterprises setup their own cyn.in behind their corporate firewalls.