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Listed here are clones of the Stack Exchange sites model.

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Some Drupal project, "SupportDO": drupal.org/sandbox/HedgeMage/1088372 –  Victor Sergienko Sep 26 '11 at 15:50
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related: Is the Stack Overflow source code available? –  David Cary Oct 19 '11 at 23:58
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What's the actual purpose for this question? –  Lipis Jun 21 '12 at 14:41
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@Lipis some companies want to implement their own branded version of this software on their own sites to supplement their support and/or knowledge base and provide a place where their customers can interact with them in a way similar to this network. All the alternatives I've investigated pretty much suck in comparison. –  Aaron Bertrand Jul 12 '12 at 13:15
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13 revisions to a 10 word non-question in 3 years on Meta. Makes sense. –  user226059 Jun 20 '13 at 19:02
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Everyone wants their Editor and Excavator badges. :o) –  Johnny Bones Jun 20 '13 at 19:31
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@user226059 well, since you went through all of the trouble of counting how many revisions there were, surely you noticed that the original question had it stated as a question which has only recently been revised into a statement. –  Stop forgetting my accounts... Sep 28 '13 at 3:11
    
The question site for the Unix window manager i3: faq.i3wm.org/questions –  handuel Dec 9 '13 at 18:54
    
Is there any white paper that explains how to build a Q&A site like SO? –  morpheus Apr 4 at 23:17
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29 Answers

Most active that look like the best bets

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).

  • Plurk Solace: Python. BSD license. No example site, and I can't find anyone using this one. Last commit was Dec 2009.

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

  • Arrayshift

Others that seem to be work in progress

  • FortyTwo: Python, Django, CouchDB. Example sitelink leads to a 404. Unknown license. Little info. [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: Rails. No example site. Unknown license. Little info. Apache license.

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

  • Kunjika: Python, Flask, and Couchbase. GNU GPLv3 or later. Documentation is here.

  • QARoR - Another open source Questions & Answers platform for Ruby on Rails. Here is the Live Demo and source on GitHub. Released under MIT License.

Sorted by language

PHP

Python

Ruby

Java

ASP.NET

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

And I don't really want to get into listing clones, but I have just come across Answer Bag which seems to be an all-encompassing clone covering everything from aviation through programming to religion. Or maybe that was there first? And Just Answer is another...

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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
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Do all these look like StackExchange sites on purpose?! –  Marco Demaio Apr 3 '12 at 20:10
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I noticed how Java was the only language without an entry. According to meta.stackoverflow.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"!) –  Feral Oink Apr 29 '12 at 1:12
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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
    
@ObsessiveFOSS You need just 1 rep to post answers (it's a fundamental right)??? –  YatharthROCK Sep 8 '12 at 17:26
    
@YatharthROCK I don't know how that text came to be, but the project is abandoned anyway. –  hexafraction Sep 8 '12 at 19:39
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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
    
@Evgeny Thanks a lot for the list. Any idea which Q&A system has most features? –  Osiris Xu Jan 4 '13 at 2:31
    
formally or formerly Qato? –  Junuxx Mar 27 '13 at 10:47
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Shouldn't Discourse be on here? –  Ian Carroll Apr 16 '13 at 0:17
    
askoverflow.com is also a clone, I suppose. –  Abubakkar Rangara Apr 28 '13 at 16:46
    
@Evgeny: There is one but not exactly a Stackoverflow type instead it's a Forum type with lots of Stackoverflow Features like badges and vote up and down and etc. mvcforum.com –  Jalali Shakib Aug 9 '13 at 20:19
    
RootBuzz is giving me an SSL error, and their Twitter account seems to be linking to a bunch of spammy junk. Maybe they're dead? –  rescdsk Aug 20 '13 at 20:37
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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 Nov 3 '13 at 15:58
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I might as well throw my two cents in. I've developed a site from scratch which uses the Stack Overflow model, but it is based on a completely different subject matter (Super Street Fighter 4):

http://sf4answers.com

Some differences/extensions:

  • There is an events section which allows for users to search on events related to the game (as well as vote up/down)
  • There is a podcasts section (again, podcasts and episodes can be voted up/down)
  • There is a notes section. Notes differ from questions in that they are one-way projections, there are no replies. Almost like blog entries, but on a specific topic that's indexed all the same.

And there are plans around other forms of data around the game as well.

I've asked a number of questions about (and on, not directly related to) Stack Overflow to help shape functionality:

All of these were used to help shape the development of the site.

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your site looks spot-on, I wish that it was an open source project..... Is it? –  RJB Feb 19 '13 at 5:32
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@rjb It is not. The new site, One Frame Link is in development, but will probably do Q&A last (I'm focusing on other tools, and as you can see, I need to do design work). Also, I'd probably do the engine much differently than I did it the first time around. However, I might make the original open source, as I don't have much use for it anymore. –  casperOne Feb 19 '13 at 12:19
    
@casperOne; Did you ever make the original open source? : D –  a25bedc5-3d09-41b8-82fb-ea6c353d75ae Sep 7 '13 at 11:31
    
@a25bedc5-3d09-41b8-82fb-ea6c353d75ae Nope. We might be integrating it into the new venture so open source isn't an option at this point. Sorry. –  casperOne Sep 9 '13 at 11:08
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The beta O'Reilly Answers site.

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Finally the first side which seems to have a more distinct look. –  mark Sep 15 '10 at 12:37
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I think the folks at O'Reilly were just doing their thing. i don't think they were trying to clone SO. –  Ben Oct 30 '10 at 19:15
    
This site is quite dead. For example, Javascript is a "trending topic", but only two questions were asked in September –  Casebash Oct 5 '12 at 4:55
    
Not a clone...... –  staticx May 15 '13 at 12:29
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codekicker.de

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it looks great! –  Andrija Cacanovic Aug 20 '09 at 19:30
    
codekicker was a closed community at first. But now they added openid, cool. –  tobsen Feb 26 '10 at 20:39
    
Is it open source? –  Nilay Parikh Jan 20 '12 at 10:48
    
@NilayParikh No, their license indicates it's closed source: All rights to design, code and content of codekicker.de reserved (except where specified otherwise). Source: codekicker.de/impressum –  Randy Burden May 18 '12 at 20:16
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HashCode (Russian: ХэшКод) - Russian clone of SO.

Also there are RootCode (РутКод) and BitCode (БитКод) related projects, which clone SF and SU respectively.

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Are these Open Source? –  Mob Sep 12 '11 at 13:13
    
Nope - don't look so. –  Idolon Sep 21 '11 at 19:25
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It's based on OSQA confirmation here. –  niki-timofe Jun 8 '12 at 18:19
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I wouldn't call my communitytracker an SO clone, but it is inspired by it. I got tired of the noise that is phpBB. I am starting to feel the pain now, I need a meta site.

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mediabrowser rocks! –  TheEmirOfGroofunkistan May 24 '11 at 2:24
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Doctype launched recently, they a have a similar concept to Stack Overflow.

http://doctype.com/

But the visual design focuses too much on the person and not enough on how good an answer is…

DocType closed on 2013-02-14, and they didn't bother to release their codebase.

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DocType whats that??? blog.stackoverflow.com/2009/08/stack-overflow-and-doctype –  jjnguy Aug 13 '09 at 14:57
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Pretty surprising that a site for web designers would chose a text size/weight that makes it look like everything is in bold for emphasis... almost as bad as everything being in caps IMO. –  U62 Aug 13 '09 at 16:22
    
There's a lot of web designers out there who appear to think that's a Good Thing. Heck, I remember the last time I looked at a web design company's website. That thing was horrible! –  David Thornley Aug 13 '09 at 21:21
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uh-oh no OpenId ... –  user132619 Aug 16 '09 at 22:29
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Stack Overflow clone in PHP -- "Qwench"

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It appears to be broken. :\ –  Ian Carroll Mar 2 '13 at 1:47
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Inspired by SO: http://www.iFixit.com/Answers

Jeff mentioned them in one of the SO blogs, http://blog.stackoverflow.com/2010/02/our-sidekick-ifixit-com/, although he got it wrong, http://ifixit.com has been around for a while (2003 http://en.wikipedia.org/wiki/IFixit), while Answers had recently been released.

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Actually it's a commercial product, available here dozuki.com/Sales/Answers –  jmd Sep 30 '11 at 17:50
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Here's another, called Verious.

Original Q:Getting 503 Service Unavailable when trying to generate discovery document

Clone: http://www.verious.com/qa/getting-503-service-unavailable-when-trying-to-generate-discovery-document/

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Quick Answers at Code Project: http://www.codeproject.com/script/Answers/List.aspx

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In fact, SO is a clone of Quick Answers :-) Quick Answers is launched in 2005, but Stack Overflow is launched in 2008. –  ProgramFOX Oct 31 '13 at 8:56
    
@ProgramFOX You're right! I found questions posted in 2006 (example) but it seems the site wasn't widely used until second half of 2008. –  Marek Grzenkowicz Oct 31 '13 at 10:35
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qato.com - not open-source, apparently clones the SE 1.0 model as well (hosting SaaS Q&A sites). It took me a while to notice why the DynDNS community support pages felt familiar.

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Why did you not add to the main Answer? –  Tshepang May 16 '11 at 12:30
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@Tshepang: if you mean this, it specifically says "open source"; I'm unable to get at qato's source anywhere, leading me to the conclusion that it is closed-source, and thus doesn't really fit there. –  Piskvor May 16 '11 at 14:27
    
Oh, I missed that. –  Tshepang May 16 '11 at 15:01
    
Apparently this was merged into answerhub. –  DIMension10 Oct 2 '13 at 7:22
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I have created one as a WordPress plugin, if you are interested. Demo here: http://demo.sabaidiscuss.com/

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I've added your plugin to the original post as after doing some searcher I think that it is probably one of the best solutions out there in the affordable price range for a small non-commercial project. –  Marek Andreánsky Mar 18 at 23:23
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http://devpytania.pl/

Polish version of StackOverflow. It's look like SO year or 2 years ago. The site looks like author don't update anything on page. Even years on foot are out date.

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Squarespace has a QA site that looks very similar to SO's model

http://answers.squarespace.com/

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Worth reading this. osqa.net is already discussed here, e.g. here. –  Shadow Wizard Mar 20 at 14:28
    
Ahh thanks for pointing that out @ShadowWizard. I should have checked that. I can delete my answer if necessary. –  aug Mar 20 at 16:53
    
As you wish, no harm in keeping it. :) –  Shadow Wizard Mar 20 at 18:40
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Like many others, I build a Stack Overflow clone as well, mostly as a learning exercise. This one might be the only open-source clone written in C# / ASP.NET MVC.

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My open source project of a Stack Overflow clone is hosted on GitHub.

It's under heavy development. And will add more functions compared to Stack Overflow.

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This one's been abandoned. It may (not) work. –  Ian Carroll Mar 2 '13 at 1:49
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http://wiki.jammer-store.com/

Seems fairly similar, I don't know if it infringes directly. See the question I posted on this site.

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I managed to get Qwench (a PHP Stack Overflow clone) from inscripts / anantgarg working under IIS 5.1 - with IIRF. Extending to provide search and additional adminstration functions to manage Q&A should make the application more useful.

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Arrayshift is a Drupal project that replicates a lot of the SO functionality. It's currently in Alpha.

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codingstack.com seems like a new attempt, no risk for SO though...

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Any idea what platform they are using (one of the open source clones, or something they wrote?) –  Tim Post May 10 '12 at 4:16
    
@TimPost - Looks like something they wrote (Ruby on Rails based) not sure if it's used by anyone but them, but I doubt it as it has 2 watchers and 1 fork (github.com/usmanasif/CodingStack) –  Eran Medan May 10 '12 at 4:19
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http://ask.badadev.com/

It's in production, but anemic, and prone to spam questions and answers. There's probably a better chance to get bada answers at SO proper.

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s41.codeinspot.com Complete with question title, original formatting, images, and profile pics... For || Comparison

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There is also MetaOptimize's community QA site. It is clearly based on the SE model in its design, style, functionality, etc. It's content is a mix of Stack Overflow programming questions and Cross Validated machine learning & data visualization questions, with perhaps bits of other SE sites thrown in. Their self description is:

Where scientists ask and answer questions on machine learning, natural language processing, artificial intelligence, text analysis, information retrieval, search, data mining, statistical modeling, and data visualization!

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