OSQA is the open source Q&A system. It 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. OSQA is built and maintained by a team of developers who share an interest in making a great, free, open source Q&A system available to everyone. The OSQA project is hosted and financially supported by DZone, Inc. Its features include
 <ul>
	<li>A question and answer engine that’s dead simple to use, has wiki-like features and a voting system</li>
	<li>A social networking engine that allows you to connect with and follow other people and topics and send private messages to each other</li>
	<li>A reputation system that lets you give and receive props for positive contributions to the community</li>
	<li>A powerful search function that helps you find relevant information quickly and easily</li>
	<li>The ability to create groups to help narrow content focus</li>
	<li>The ability to export site data</li>
	<li>The ability to easily federate content that’s created on your site (federating content = reusing content generated on one of your sites in another)</li>
	<li>The ability to import data from your current or old Stack Exchange site</li>
	<li>Support for widgets to expand functionality</li>
	<li>Automatic site activity reports</li>
	<li>The ability to customize your site using themes</li>
	<li>The ability to embed videos, audio and images</li>
</ul>

OSQA is the open source Q&A system. It 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. OSQA is built and maintained by a team of developers who share an interest in making a great, free, open source Q&A system available to everyone. The OSQA project is hosted and financially supported by DZone, Inc.

OSQA - Stackoverflow like QA system in Python

phpMyFAQ is a multilingual, completely database-driven FAQ-system. It supports various databases to store all data, PHP 5.2 (or higher) is needed in order to access this data. phpMyFAQ also offers
 <UL>
	<LI>Multi-language Content Management-System</LI>
	<LI>User and group based permissions</LI>
	<LI>LDAP and HTTP authentication</LI>
	<LI>Active Directory support</LI>
	<LI>Revision system</LI>
	<LI>Community modules</LI>
	<LI>FAQ statistics</LI>
	<LI>Backup and Restore</LI>
	<LI>Templating system</LI>
	<LI>Powerful search</LI>
	<LI>OpenSearch and Microsummaries support</LI>
	<LI>User comments</LI>
	<LI>Smart answering</LI>
	<LI>Integrated WYSIWYG HTML editor</LI>
	<LI>Browse by Category or Tags</LI>
	<LI>Sitemap support</LI>
	<LI>Advanced spam protection</LI>
	<LI>Exports your FAQ</LI>
 </UL>

phpMyFAQ is a multilingual, completely database-driven FAQ-system. It supports various databases to store all data, PHP 5.2 (or higher) is needed in order to access this data. phpMyFAQ also offers a multi-language Content Management-System with a WYSIWYG editor and an Image Manager.

phpMyFAQ

Lampcms is an full-featured Open Source Question and Answers web program with support for social web with the integration with Facebook and Twitter. Lampcms is tag-based, all questions are tagged by the author and can then be grouped by tag. 

It has all functionalites related to Q&A website. Post new question, Edit, Delete and Close existing questions. Question author has full control on the questions posted by them. Moderator will have full admin rights. User can vote questions up/down and also could select best answer. 
 
Ip-Based Geo Location stored with posts, can use to plot items on Google Map. It is capable of handling very high-load websites, easily serving thousands of simultaneous requests. It counts one view per Question per User or per IP if user not logged in.

Lampcms is an full-featured Open Source Question and Answers web program with support for social web with the integration with Facebook and Twitter. Lampcms is tag-based, all questions are tagged by the author and can then be grouped by tag.

LampCMS - Q&A program in PHP

A Q&A site helps your online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast. Refer to the demo page <A HREF="http://www.question2answer.org/qa/" target="_blank">http://www.question2answer.org/qa/</A>. It is open source but with some restrictions. Check out its <A HREF="http://www.question2answer.org/license.php" target="_blank">license page</A> 
 Its feature include
	 <UL>
			<LI>Five minutes (or less!) to install</LI>
			<LI>Easy styling with CSS themes.</LI>
			<LI>Fast integrated search engine.</LI>
			<LI>Points-based reputation management.</LI>
			<LI>Question tagging (with auto completion).</LI>
			<LI>Comments on questions and answers.</LI>
			<LI>Simple and secure admin interface.</LI>
			<LI>PHP/MySQL scalable to 1,000,000+ users.</LI>
			<LI>Built-in user account management, or...</LI>
			<LI>Single sign-on for existing sites.</LI>
	 </UL>

A Q&A site helps your online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast.

Question2Answer - Stackoverflow styled, PHP base Q&A system

ASKBOT is a open source Q&A system similar to 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. Refer the Demo site <A HREF="http://askbot.org" target="_blank">http://askbot.org</A>

 <UL>
	<LI>Reputation system similar to Stackoverflow</LI>
	<LI>Possibility to mark questions and answers community Wiki</LI>
	<LI>Graphical reputation statistics</LI>
	<LI>Full featured Markdown editor</LI>
	<LI>Live preview while editing</LI>
	<LI>Ability to edit other users' questions</LI>
	<LI>Revision history</LI>
	<LI>Graphical diff (highlighting of differences between revisions) </LI>
	<LI>Basic tagging functionality</LI>
	<LI>Notification of responses on the user page</LI>
	<LI>A vote cast can not be retracted anymore after a certain amount of time</LI>
 </UL>

ASKBOT is a open source Q&A system similar to 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.

ASKBOT

Shapdo is a open source Q&A system similar to StackOverflow, Yahoo Answers and some others. It has all the features you would want for a good social Q&A site plus a few more (theming, custom editor), email alerts per questions, following favorite users and one of our key feature is i18n for the UI and for the questions. Tagging and Badging support. Refer the Demo site <A HREF="http://shapado.com/" target="_blank">http://shapado.com/</A>

Shapdo is a open source Q&A system similar to StackOverflow, Yahoo Answers and some others. It has all the features you would want for a good social Q&A site plus a few more (theming, custom editor),  email alerts per questions, following favorite users and one of our key feature is i18n for the UI and for the questions. Tagging and Badging support.

shapado - Stackoverflow like QA system in Ruby

Qwench is a PHP/mySQL based StackOverflow clone. It allows users to post questions and answers and also to post an article as a knowledge-base. It supports points system similar to StackOverflow. 
 Demo: <A HREF="http://anantgarg.com/qwench" target="_blank">http://anantgarg.com/qwench</A>
 <img src="/AppImages/Article/qwench-300x144.jpg" alt="" class="float-center">

Qwench is a PHP/mySQL based StackOverflow clone. It allows users to post questions and answers and also to post an article as a knowledge-base. It supports points system similar to StackOverflow.

Qwench - PHP StackOverflow Clone

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OSQA - Stackoverflow like QA system in Python

phpMyFAQ

LampCMS - Q&A program in PHP

Question2Answer - Stackoverflow styled, PHP base Q&A system

ASKBOT

shapado - Stackoverflow like QA system in Ruby

Qwench - PHP StackOverflow Clone

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OSQA - Stackoverflow like QA system in Python

phpMyFAQ

LampCMS - Q&A program in PHP

Question2Answer - Stackoverflow styled, PHP base Q&A system

ASKBOT

shapado - Stackoverflow like QA system in Ruby

Qwench - PHP StackOverflow Clone

TechStack

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