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A Q&A site helps an online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast. Question2Answer is a popular Q&A solution.

OSQA is the free, open source Q&A system you've been waiting for. Your OSQA site 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.

AllAnswered.com allows any community to create question and answer boards for any topics that they are interested in. It is absolutely free to use no matter how big or small your community is. AllAnswered.com strives to be the place where people can get their questions answered and build a strong community by helping each other.

Answerbase looks to offer enterprise grade social Q&A to websites of every size, in a web platform that is easy to setup and manage.The platform is built and managed by Lumin Creative, who has been powering Q&A communities for some of the world’s most popular websites for years. Through Answerbase, Lumin Creative brings this powerful social Q&A platform to sites at every level. Our team is comprised of professionals and engineers with years of experience providing Q&A and social media solutions. Companies such as Edmunds.com and Angie’s List can attest to the fact that with Answerbase you can count on an outstanding product with reliable service and support.Answerbase offers a free trial as you get a feel for the service and has pricing tiers that will satisfy any level of client. Whether you are a startup website or blog or one of the most well trafficked sites in the world….we can serve you. With pricing starting at $15 per month, take a look at our available tiers today to see which one fits your needs. »

BitAsker is a paid question and answer plateform using Bitcoin ... a user can win money by answering a question.

Kiunei is a simple, corporate Q&A tool for large events. (Inspired by Google Moderator .)

Niko gives us all a way to surface important questions, ideas, and concerns in a way that decision-makers and stakeholders can engage constructively before small problems become big ones. Unlike bulky, “sad-making” HR software, Niko is the single-purpose, simple, and intuitive solution to make sure everyone feels heard.