OpenACS OpenACS
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CMS Type License
General CMS  GPL 
    OpenACS (Open Architecture Community System) is an advanced toolkit for building scalable, community-oriented web applications. If you're thinking of building an enterprise-level web application, OpenACS is a solid, proven foundation that will give you a 3-6 month headstart.

The OpenACS toolkit is based on the ArsDigita Community System. ArsDigita kindly GPL'd their work, making all of this possible.

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