Stack Overflow, part of Stack Exchange, 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.

Apache Answer is described as 'Q&A platform software for teams at any scale. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache Answer' and is a Q&A service in the education & reference category. There are more than 10 alternatives to Apache Answer for a variety of platforms, including Web-based, Self-Hosted, PHP, Linux and Cloudron apps. The best Apache Answer alternative is Stack Overflow. It's not free, so if you're looking for a free alternative, you could try Stack Overflow or Discourse. Other great apps like Apache Answer are Flarum, Vanilla Forum, Question2Answer and Forem.
Stack Overflow, part of Stack Exchange, 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.

Discourse is an open source discussion platform built for the next decade of the Internet. A modern forum, everything's been redesigned to be easy.




Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum...




Flarum is free, open-source forum software with a focus on simplicity. You can use Flarum to easily set up a discussion forum for your website. Flarum is developed openly on GitHub.




Vanilla provides a standards-compliant, multi-lingual, theme-able and pluggablecommunity forum software that powers discussion forums on 800,000 sites.


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.

Tribe is a white-label platform, empowering the new generation of online communities. It boosts users engagement and growth through widgets and integrations to existing stacks.




Gone are the days of needing to make a whole bunch of different tools work together. With Circle, you can combine the exciting, interactive nature of a community with your content — all in one seamless experience.



