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Stack Overflow is a free, community-driven, reputation-based Q & A site for computer programmers. No membership is required to ask questions or provide answers to questions by others. Registered users...

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 …

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.

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 …

Open source question and answer forum written in Python and Django

Shapado is an open source question-answer system written in Ruby, Mongomappe and Mongodb

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 …

The Mission Our 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 …

Social Q&A network! Send and receive anonymous questions, and find out what others think about you.

QsQs - это сервис вопросов и ответов, задавайте вопросы на любые темы и получайте практические ответы.

Twithelp™ lets you use the huge Twitter community to get help with anything you want - simply and quickly. You can also help other people with things you know about, …

Answers is the place to go to ask questions and receive answers from the community at large on any topic. Connect with people who know the answers to your questions …

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

Slant is a collaboratively edited resource that helps you quickly make decisions. Instead of having to read multiple blog posts or dig through comment threads you can read summarized perspectives …

Coordino allows you to create a question and answer system for you and your users to enjoy. Whether you are looking to create a niche question and answer site for …