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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.
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.
LimeSurvey is an open source survey application. Each application could have unlimited surveys and each survey could have unlimited questions and participants. Almost 20 different question types are supported. Images and videos could be uploaded for a survey. It has better users and group management. The access to the survey could be restricted to group.
Ephyra is a modular and extensible framework for open domain question answering (QA). The system retrieves accurate answers to natural language questions from the Web and other sources. The goal is to give researchers the opportunity to develop new QA techniques without worrying about the end-to-end system.
Vanilla is a powerful community publishing platform, and it comes with a great set of features. It has add-ons to embed your vanilla forums in to any of the site with single line of code. User will be allowed to login with their Facebook, Twitter, Google and OpenID account.
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.
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.
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.