Stack Overflow
Free
Stack Overflow is the largest online community for programmers to learn, share their knowledge, and advance their careers.
Glisser
Freemium
Glisser is an online platform that allows you to create interactive presentations that can be used for marketing, training.
AskBot
Freemium
AskBot is a Django/Python Q&A forum.
Stack Exchange
Free
Stack Exchange is a network of question-and-answer websites on topics in varied fields.
Question2Answer
Open Source
Question2Answer is a free and open source platform for Q&A sites.
Yahoo! Answers
Free
Yahoo! Answers is a community-driven question-and-answer (Q&A) website.
Compare OSQA with alternatives
Compare Stack Overflow and OSQA and decide which is most suitable for you.
Compare Stack Exchange and OSQA and decide which is most suitable for you.
Compare Question2Answer and OSQA and decide which is most suitable for you.
Compare Yahoo! Answers and OSQA and decide which is most suitable for you.