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Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum entanglement, computer programmers can ask about JavaScript date formats, and photographers can share knowledge about taking great pictures in the snow.

Quora.com is a question/answer service allowing users to pose questions that other users can answer, each question and answer can have comments, each users can write one individual answer and there can be a summary answer.Each user can choose a description explaining their area of expertise or questions and answers can be anonymous.Questions and answers are searchable.

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.

Startups get your queries answered by the World's Top Investors and Entrepreneurs. Startups + Investors +Entrepreneurs Connect.

Askbot is a Q&A system, like 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.

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.

Solace is a fully open-sourced multilingual support and knowledge exchange platform written in Python.

Shapado is a questions and answers site for your enterprise or community, your “knowledge base on the cloud”. It makes sure questions never get asked twice by making the information flow.

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.

Use Shrtct to prepare your team, make important decisions, gather and store information, plan, debate and hash it out. Everywhere and anytime.

Curositi is a caring and supporting community of people who are eager to learn things. It provides an environment that offers opportunities to communicate new knowledge and solve problems through collaboration with experts and other members of curositi.Curositi helps individuals to engage in a meaningful inquiry based learning that has genuine value. We are encouraging individuals to invest in learning things which they truly care about and make it a habit, rather than viewing it as an activity forced upon them. »

QueryHome is a question-answer platform, which helps you to get answers of your technical problems in a social setup. QueryHome provides users to ask question in different fields like IT,sports, puzzles. provide facility to jobs and articles publishing. Registered users collect 'points' by participating, and can subsequently up- or down-vote answers by other users, leave comments and edit content in a wiki-style fashion.

Boardest.com is a multi-lingual forum, question/answer and link sharing service allowing users to ask questions, open discussion threads and share links that other users can comment and contribute.