INACTIVE NOTICE: This plugin is unsupported by WPMUDEV, we've published it here for those technical types who might want to fork and maintain it for their needs.
Give WordPress a fully-featured questions and answers section – just like StackOverflow, Yahoo Answers and Quora.
This extensive powerful plugin covers all the question and answer bases right out of the box. It's fully operational in moments but highly customizable and can be styled to fit any theme.

Integrated voting for both questions and answers is engaging and pushes the best answers to the top. Give users involved with the ability to answer questions, get votes and earn reputation points that display on a personal profile page.

Assign categories and tags, sort unanswered questions and use integrated search to build an easy to navigate knowledge base. Plus, subscribe to questions and receive emails when new answers are posted.

Lowers the barrier to entry and grow your community faster. Give anonymous visitors the ability to post and answer questions, that queue and publish after they successfully login. Get fine-tuned control over what each user role can do.