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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.

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.

Yahoo! Answers is a way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

The MissionOur patented knowledge-sharing process, combined with the advantages of the Internet, allow us to change the way people solve their technology problems, gather information and share knowledge. The Experts Exchange Team is united in one vision: building the worlds best collaboration and knowledge-sharing solutions.HistorySince 1996, Experts Exchange has pioneered collaboration and knowledge sharing. Over 3,857,959 IT professionals from fortune 1000 companies from nearly every country in the world have signed up and used Experts Exchange as a way to solve their technical problems. Over 253,291 expert members have collaborated to create a searchable knowledge base of over 16,224,282 postings of previously answered questions. In 2000, Experts Exchange was awarded a patent for its knowledge sharing process. Experts Exchange has partnered with category leaders such as Oracle, Merrill Lynch, Zend, Research In Motion, Altavista, Network World, and many others.Welcome to Experts ExchangeExperts-Exchange.com is an IT and computer solutions community of more than 50,000 experts dedicated to exchanging knowledge and solving your technical problems. Experts Exchange is the most efficient and reliable IT resource on the Internet as evident by more than 2.6 million tech solutions. »