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Since the source code for this site isn't available for purchase or external use, I'm looking for software that can run a Q&A environment similar to Stack Exchange. Are there any such pieces of software available?

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Stack Exchange has released an updated, feature-complete version of the Stack Overflow engine which is now available for enterprise use. You can read more about that here

The Stack Exchange engine is available for use

(Note that this is different from Stack Overflow for Teams, which is a hosted solution.)

But if that does not meet your needs, there are several third-party tools that try to clone at least some of the functionality here.

Most active that look like the best bets

Open source

Not open source

  • AllAnswered: Django. Include Q&A in its knowledge management system. Not Free.

  • AnswerHub: Java. Live site. Enterprise Q&A by the people who created OSQA. Not free.

  • Confluence Questions: Java. Enterprise Q&A developed and supported by Atlassian. Not free.

  • Haydle: SaaS, free 30 day trial. Haydle is focused on being a private, internal Q&A system.

  • Q&A: Live Site. WordPress Plugin. Actively developed by a company that looks reliable. No longer free; $19 to download (with no membership)

  • Quandora

  • Rootbuzz: Django, hosting, actively developed, non-free

  • SabaiDiscuss: commercial WordPress Plugin

  • Programlama: Python, flask (In Turkish)

  • Unity Answers: Allowed topics are the Unity editor and C# (the site is free and in English)

Ones that look sort of finished

  • shapado: Ruby, mongomapper and MongoDB. Live site, also provide hosted sites for a fee. AGPLv3. Seems to be under active development.

  • OSQA: Django. Live site. GPLv3. More actively developed fork of CNPROG. OSQA is in maintenance mode, with security and Django platform updates, but few new features. AnswerHub has replaced OSQA as DZone's primary Q&A solution.

  • openoverflow: Ruby, PostgreSQL, Haml. MIT license. No example site, and I can't find anyone using this one. Not a lot of recent activity; last code commit, May 2009.

  • phpancake: PHP, Zend framework, MySQL. Live site. MIT license. Last activity Jan 2010. Renders very poorly in some browsers.

  • cahoots: PHP, MySQL. GPL, MIT license. Officially inactive; demo site offline; last update Aug 2010.

  • Coordino: PHP, MySQL. MIT license. feature tour;

  • Qwench: PHP. Example site (no pages except question list). No activity since Dec 2009.

  • soclone: Django framework. MIT license. Seems to have gone stale in Nov 2008 (and only started on Google Code at the end of Oct 2008).

  • Solace: inactive

  • Kliqqi: Demo. PHP, MySQL. Different look, hosting available. Not active, CC-BY 3.0 license

  • stacked: ASP.NET, Ra-Ajax, ActiveRecord ORM. GPLv3.

  • Arrayshift

  • Kunjika: Python, Flask, and Couchbase. GNU GPLv3 or later. Documentation is here. Website not reachable anymore as of October 2019.

Others that seem to be work in progress

  • Asking: Perl, Mojolicious. Perl License (Artistic). Little documentation at this point. GitHub repository README.md in Portuguese.

  • FortyTwo: Python, Django, CouchDB. Example site link leads to a 404. Unknown license. Little information. [Last commit in January 2011]

  • kerjakelompok: No example site. Unknown license. Little info.

  • SmartR: No example site. MIT License. Little info.

  • Stack Underflow: C#. No example site. License is "do whatever you want with it" (I haven't defined a formal license yet). Written as a learning project.

  • T002_rails-overflow: Ruby on Rails. No example site. Unknown license. Little info. Apache license.

  • CNPROG: Python/Django. Project officially closed. Was used as base by OSQA & Askbot.

  • QARoR - open source questions & answers platform for Ruby on Rails. Here is the demo and source on GitHub. Released under MIT License.

Sorted by language

PHP

Perl

Python

Ruby

Java

Scala

ASP.NET

MEAN (MongoDB, Express, AngularJS, and Node.js)

Did I miss any? Disagree? Please add a comment or update this answer.

  • 23
    Not sure where this comment belongs, but I recently deployed and customized Question2Answer in 15 minutes, whereas OSQA took hours and still isn't working right. FWIW! – goodytx Mar 8 '12 at 16:55
  • 34
    Do all these look like StackExchange sites on purpose?! – Marco Demaio Apr 3 '12 at 20:10
  • 2
    I noticed how Java was the only language without an entry. According to meta.stackexchange.com/a/109004/160875 Qato is written in Java. (The original question asked for web apps inspired by the StackExchange system, but didn't specify open source. Some of the other answers mention non-open source implementations of SE, but I had my eye on that None known spot under "Java"!) – Ellie Kesselman Apr 29 '12 at 1:12
  • 7
    After getting tired of OSQA and its django dependencies, I installed question2answer and worked great so far: pretty complete, lots of plugins. – Deigote Jun 6 '12 at 11:50
  • I may be building a stackoverflow clone in the near future - anyone know pros and cons of building it myself from scratch vs. using something like Q&A (the WordPress plugin)? – jbyrd Aug 12 '12 at 1:15
  • 2
    Do any of these clone SE's excellent chat? For my Q&A needs, I'm OK with using the SE family, but that chat is fantastic and I'd love to see it (or something like it) start replacing IRC. – KRyan Dec 7 '12 at 5:43
  • 7
    Shouldn't Discourse be on here? – StackExchange User Apr 16 '13 at 0:17
  • 1
    shapado only receives translation updates for over a year now, gitorious.org/shapado/shapado/activities. Likewise, OSQA also isn't very active with a mere 5 commits this year (github.com/dzone/osqa/commits/master). – Nico Schlömer Nov 3 '13 at 15:58
  • 3
    @disgruntledgoat Why remove QARoR? – Adam Davis 'ze-zir-zem' Apr 28 '14 at 15:07
  • 2
    @Adam although there is a section for "half finished clones" that one didn't look very developed at all. Also it looks like the person who added it is the developer; I thought that would count as spam. If others think the project is fine, go ahead and put it back. – DisgruntledGoat Apr 29 '14 at 9:08
  • 3
    Hello, Im the QARoR developer and put it into this topic. What can i say more about development... StartX Stanford already use QARoR, so its not that bad right? There are few apps here which "didn't look very developed at all" for example T002_rails-overflow. DisgruntledGoat, give people a proper choice. @AdamDavis if you think its interesting app, do us a favor and put it back. Thank you! – mateuszdw Jul 12 '14 at 8:46
  • 1
    Saying AnswerHub is a clone of Stack Exchange is basically saying that any Q&A site with quality is a clone. Following that logic let's add Quora as a clone! – JDSweetBeat May 20 '15 at 15:43
  • 1
    @Evgeny Thanks for an awesome answer! I'm trying to look for the ones that has an API using which I can include a similar Q&A inside my mobile app. I am still to find an open source one. Do you know one by any chance ? – Shobhit Puri Jul 19 '15 at 20:14
  • 9
    This answer needs an overhaul. Plenty of things are now stale, or not in active development. – ankitjaininfo Jul 2 '16 at 14:28
  • 1
    Have a look at this github.com/xameeramir/StackOverflowClone then. Completely free Stackoverflow clone – xameeramir Mar 28 '17 at 12:28

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