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Listed here are clones of the Stack Exchange sites model.

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6  
See also blog.bitquabit.com/2009/07/01/one-which-i-call-out-hacker-news –  Jakub Narębski Jul 7 '09 at 17:06
 
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
 
@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
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26 Answers

up vote 380 down vote

Most active that look like the best bets

  • AnswerHub . Java. Live site. AnswerHub is a full-featured enterprise Q&A platform built by the people who created OSQA. AnswerHub is actively used by eBay, LinkedIn, GE, NetApp, Epic Games, Unity3D, Havok Games and many more leading companies.

  • ASKBOT Django hosting, code, docs, import data. GPLv3. To install type "pip install askbot".

  • LampCMS Live site PHP 5.3, MongoDB LGPL 3 License

  • Question2Answer. Live site PHP, MySQL. Not quite so active. GPL license.

  • Q&A. Live Site (currently 404) WordPress Plugin. Actively developed by a company that looks reliable. No longer free; $19 to download (with no membership)

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

  • Pligg Has a demo, is free, looks a bit different then stack overflow and is missing some features. It is a little more related to reddit. It is in development still and they are taking suggestions for features, themes, and modules. You can request this stuff and fix bugs in the demo. Make sure to check it out here. Has hosting, is powered by PHP and MySQL, and is customizable and user friendly to the owner and users.

  • [Quandora] http://www.quandora.com

  • Haydle SaaS, free 30 day trial. Haydle is focused on being a private, internal Q&A system, so has some different features that make sense when used internally like teams, etc.

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. Django. Live site(Update 21/01/2011: link leads to a page which says CNPROG is officially closed). GPLv3. Not a lot of recent activity; last code commit, Oct 2009 (as of Feb 2010). Primarily developed in Chinese, although there are English translations.
    No longer supported according to the website. Was used as base by OSQA & Askbot

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

Sorted by language

PHP

Python

Ruby

ASP.NET

C#

Java

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...

Note: AnswerHub was formally Qato.

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8  
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
12  
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
 
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
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 Nov 3 '13 at 15:58
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up vote 15 down vote

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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up vote 14 down vote

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
16  
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...... –  0A0D May 15 '13 at 12:29
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up vote 12 down vote

codekicker.de

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it looks great! –  Andrija 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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up vote 8 down vote

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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up vote 8 down vote

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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up vote 7 down vote

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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3  
DocType whats that??? blog.stackoverflow.com/2009/08/stack-overflow-and-doctype –  jjnguy♦ Aug 13 '09 at 14:57
5  
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
1  
uh-oh no OpenId ... –  user132619 Aug 16 '09 at 22:29
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up vote 6 down vote

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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up vote 5 down vote

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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up vote 4 down vote

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

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1  
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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up vote 4 down vote

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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up vote 3 down vote

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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2  
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's Semifinite Monkeys 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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up vote 2 down vote

I have created one as a WordPress plugin, if you are interested. Demo here: http://demo.sabaidiscuss.com/

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up vote 2 down vote

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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up vote 1 down vote

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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up vote 1 down vote

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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up vote 1 down vote

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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up vote 0 down vote

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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up vote 0 down vote

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

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up vote 0 down vote

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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up vote 0 down vote

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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up vote 0 down vote

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

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