Stack Overflow

stack overflow, part of stack exchange , is a free, community-driven, reputation-based q & a site for computer programmers.

Free Android iPhone Web

Quora

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.

Free Android iPhone Web

Solace

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

Free Open Source Mac OS X Windows Linux Web

Inqwise

Online survey software & questionnaire tool. Powerful survey software to create surveys, collect responses and analyze results.

Freemium Web

Shrtct

Shrtct is a productivity tool for teams, providing in-context communication (chit chat free!) via Shrtct Hashes.

Free Personal Web

AllAnswered

AllAnswered.com is a free hosted service for any community to build their own Stack Overflow-like Q&A board. Check it out to see how easy it is to have your own Stack Overflow.

Free Mac OS X Windows Linux Android iPhone Android Tablet Chrome OS Web

Answers

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...

Free iPhone

Starty.co Answers

Discover Answers, the powerful little $99 Q/A web application that notably improves your user’s experience. Download, install, and plug-in Answers to your existing...

Commercial Windows Linux