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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. Refer the Demo site http://askbot.org
Reputation system similar to Stackoverflow
Possibility to mark questions and answers community Wiki
Graphical reputation statistics
Full featured Markdown editor
Live preview while editing
Ability to edit other users' questions
Graphical diff (highlighting of differences between revisions)
Basic tagging functionality
Notification of responses on the user page
A vote cast can not be retracted anymore after a certain amount of time
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.
phpMyFAQ is a multilingual, completely database-driven FAQ-system. It supports various databases to store all data, PHP 5.2 (or higher) is needed in order to access this data. phpMyFAQ also offers a multi-language Content Management-System with a WYSIWYG editor and an Image Manager.
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.
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.
Rainbow CMS available today in 29 languages, allows content authoring to be safely delegated to role-based team members who need little or no knowledge of HTML. Rainbow optionally supports a two-step approval-publish process. 75 plug-in modules are now included in the standard release. It is also fairly easy to build your own custom modules.
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.