The best open source alternative to Stack Exchange is Codidact. If that doesn't suit you, our users have ranked more than 50 alternatives to Stack Exchange and 18 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Stack Exchange are Aether, WikiSpooks.com, Tildes and TopAnswers.
Ever had a question? Ever had an answer? Ever had knowledge to share? We believe that coming together to inquire and learn, to share knowledge and to teach each other, makes the world a better place. We also believe that Q&A communities should be free from the politics and...
It's one of the few on this list that's an actual alternative and not just community forums
WikiSpooks is a global alternative encyclopedia on politics, spy craft, deep state intelligence, and conspiracies, free of corporate influence, partisan politics, or government propaganda for historians and truth-seekers to read, edit, and share.
TopAnswers is what Stack Overflow should be: focused on communities and knowledge sharing, not profit. We share some of the same aims:
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.
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.
This is not a website/service/forum like Stack Exchange, Reddit, Quora, etc. Rather, it is software to create a Q&A website or add Q&A to an existing website.
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 points and badges for useful participation, and everyone in the community wins.
Unsatisfied with the few link sharing communities that were available and their proprietary, untransparent and non-secure nature, ziq made the original raddle.me (then known as raddit.me) with Wordpress, but it had a lot of limitations.
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.
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It's free open source and is non-profit compared to Stack Exchange being a 'for-profit' organization