Description:
An open-source knowledge-based community software. You can use it quickly to build Q&A community for your products, customers, teams, and more.
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Elgg
Description:
Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization through to a brand-building communications tool for your company and its clients.