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

Question2Answer

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.

Free Open Source Mac OS X Windows Linux Web Self-Hosted PHP MySQL Community Edition

Yahoo! Answers

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.

Free Web

Askme

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

Free Web

AskBot

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.

Freemium Web Self-Hosted Django Python

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.

Free Open Source Web Self-Hosted Django Python

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

Shrtct

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

Free Personal Web

Scoold

Scoold is inspired by StackOverflow and implements most of its features. You can ask and answer questions, upvote and downvote posts, earn badges and reputation.

Free Open Source Web Self-Hosted

Bitfortip

Bitfortip offers a unique use case thanks to Bitcoin. Use Bitfortip to: Find a item (i.e. a dress ) that you saw on a magazine,website, Pinterest or Instagram and you don't know where to buy it online.

Free Android Web

Coordino

Coordino allows you to create a question and answer system for you and your users to enjoy.

Free Open Source Linux Web Self-Hosted

QueryHome

QueryHome is a Knowledge Social Network for people to come together and ask technical doubts and contribute by answering questions, solving doubts and writing articles.

Free Open Source Android Android Tablet Web

Experts Exchange

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...

Commercial Web

Boardest

Boardest.com is a 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.

Free 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

Samebug

Debugging assistant for developers. Samebug provides resources to help you fix crashes efficiently.

Free Mac OS X Windows Linux Chrome OS Web

Tesse

Tesse is an expert search engine which allows you to search and connect with global experts by a keyword of skills or expertise. It is an on-demand platform for...

Free Android iPhone Web

asktopia

asktopia is a global network for business professionals to ask and answer questions about real world problems they need to solve or the “whys” and “hows” of specific...

Free Web