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OSQA is the open source Q&A system. It is more than just an FAQ page, it is a full-featured Q&A community. Users earn points and badges for useful participation, and everyone in the community wins. OSQA is built and maintained by a team of developers who share an interest in making a great, free, open source Q&A system available to everyone. The OSQA project is hosted and financially supported by DZone, Inc.
Discourse is a platform for community discussion. Whenever you need a mailing list, a forum to discuss something, a chat room where you can type paragraphs, consider Discourse. It provides a flattened discussion, which avoids the pains of threaded forums, and delivers a more robust, intuitive interface to join a conversation at any point.
Lampcms is an full-featured Open Source Question and Answers web program with support for social web with the integration with Facebook and Twitter. Lampcms is tag-based, all questions are tagged by the author and can then be grouped by tag.
Shapdo is a open source Q&A system similar to StackOverflow, Yahoo Answers and some others. It has all the features you would want for a good social Q&A site plus a few more (theming, custom editor), email alerts per questions, following favorite users and one of our key feature is i18n for the UI and for the questions. Tagging and Badging support.
ASKBOT is a open source Q&A system similar to StackOverflow, Yahoo Answers and some others. Askbot is based on code of CNPROG, originally created by Mike Chen and Sailing Cai and some code written for OSQA.
A questions and answers system, where the validity of the questions and their answers is determined and moderated by the community by a voting system. This open source system is on the lines of Stackoverflow and digg.