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Listed here are clones of the Stack Exchange sites model.

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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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Isn't StackExchange itself a clone of other Q&A sites? Q&A sites with reputation points for good answers have been around for years - I joined Perlmonks back in the year 2000 (it's still going strong). I see SE as a fairly recent arrival. – A E Nov 19 '14 at 10:08
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Some companies want to host their own, internal, private Q&A sites. – lambmj Jun 26 '15 at 23:27
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“666 Stack Exchange clones” → Nobody is allowed to vote on this anymore, right? – SevenSidedDie Dec 28 '15 at 3:35

35 Answers 35

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

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Ask Fedora -- an SE-style website on Fedora Linux.

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actually it is based on askbot, as their web site mentioned: (askbot.com) – Tomofumi Jun 13 '14 at 4:12

Biostar has several scientific sites going with it.

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Apparently OpenStack has its own Ask OpenStack.

(I am not sure if this is based on AskBot or not, and if so, whether it deserves its own entry or not.)

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The Answers module, available for Drupal version 7, can be used as a plugin to add a Question & Answer section to any Drupal 7 based website. Some more details about it, from its project page:

... enables the implementation of a Question & Answer system in a Drupal site. Users can post questions and other users can answer them. To see it at work (based on the most recent 7.x-4.x-dev version).

Head over to its Demo site and have a look at the example Questions and/or Answers there.

These modules related to the Answers module are enabled in this demo site:

  • The "core" Answers module, which enables the content types "Question", and "Answer" (whereas Answers are displayed below the Question they relate to).
  • The Answers Theme sub-module, which transforms the (rather boring) vanilla display of a Question (and its related Answers below it), into a way more attractive look-and-feel. Such as the orange bubble that is added around the question (to better highlight it).
  • The Answers Best Answer sub-module, which allows for marking any of the answers to a specific question as the best (accepted) answer (to display the blue checkmarks to the left of each answer, and which is replaced by a green checkmark when an answer is marked as the best answer).

And there are more interesting features that are available (and enabled in this site), such as:

  • The Answers Notification sub-module to allow logged in users to subscribe to selected questions, so that they receive notifications (using the Message Stack) when Questions receive Answers.
  • The Answers Voting sub-module to implement a system to upvote or downvote either Questions and/or Answers (which uses the Rate module).
  • The Answers Userpoints sub-module to increase or decrease "reputation points" (which uses the Userpoints module) on events such as up- or down-voting on a question or answer, or marking an Answer as the "Best Answer".

For an interesting video tutorial about this module (still using the old 7.x-3.x version), refer to Creating a question and answer website in Drupal.

Disclosure: I'm a (co-) maintainer of this module.

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