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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.
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.
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.
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.