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OSQA - OSQA is the free, open source Q&A system you've been waiting for.
Question2Answer - A Q&A site helps an online community to share knowledge.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Super User - Super User, part of https://alternativeto.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
AskBot - Askbot enables users to create Q&A forums.