OSQA is an acronym that sands for “open source question & answer.” OSQA is a very flexible tool for building rich, self-organizing online communities. OSQA features multiple authentication methods (use your Twitter, Facebook, Gmail, etc. account to login), gamification, tagging, notifications, badges, search and more. Admins will appreciate the community policing features in OSQA that allow the community to flag comments as spam or junk so that they can be automatically banned from the site.
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Askbot and AnswerHub are the supported forked versions of OSQA I've seen, but OSQA is free and easy to setup, especially with Bitnami. Be sure to use the GPlus forum-module found here: https://github.com/jordanjambazov/osqa-gplus
User registration spam is pretty bad, but with Recapcha turned on and limiting their actions, it gets better.
After my first review, Bitnami had the google cloud integration working in no time! Now just need to be able to edit previous reviews ;)
With OSQA, I can establish a StackOverflow liking site. I use it as our internal knowledge base. It's very easy to use and manage.