TWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins. TWiki fosters information flow within an organization, lets distributed teams work together seamlessly and productively, and eliminates the one-webmaster syndrome of outdated intranet content. TWiki has been downloaded over 500,000 times and is used daily by millions of people in over 100 countries. Some larger deployments have several 100,000 pages and over 10,000 users. TWiki is a cgi-bin script written in Perl. It reads a text file, hyperlinks it and converts it to HTML on the fly. Its main features include
 <UL>
	<LI>Edit existing pages or create new pages by using any web browser</LI>
	<LI>To edit a page, simply click on the Edit link at the bottom of every page. </LI>
	<LI>Web pages are linked automatically. You do not need to learn HTML commands to link pages. </LI>
	<LI>Simple, powerful and easy to learn text formatting rules</LI>
	<LI>Pages are grouped into TWiki webs (or collections). This allows you to set up separate collaboration groups.</LI>
	<LI>Full text search with/without regular expressions</LI>
	<LI>E-mail notification</LI>
	<LI>Structured content: classify and categorize unstructured web pages</LI>
	<LI>File attachments</LI>
	<LI>Revision control</LI>
	<LI>Access control</LI>
	<LI>Plugin support</LI>
	<LI>Templates and skins</LI>
	<LI>Managing pages</LI>
	<LI>Managing users</LI>
	<LI>Generate statistics</LI>
 </UL>

TWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. TWiki is a cgi-bin script written in Perl. It reads a text file, hyperlinks it and converts it to HTML on the fly.

TWiki - Wiki and Web 2.0 Application Platform

MediaWiki is powers Wikipedia.org. MediaWiki is designed to be run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich wiki implementation. Pages use MediaWiki's wikitext format, so that users without knowledge of XHTML or CSS can edit them easily. When a user submits an edit to a page, MediaWiki writes it to the database, but without deleting the previous versions of the page, thus allowing easy reverts in case of vandalism or spamming. MediaWiki can manage image and multimedia files, too, which are stored in the filesystem. For large wikis with lots of users, MediaWiki supports caching and can be easily coupled with Squid proxy server software.

MediaWiki is powers Wikipedia.org. MediaWiki is designed to be run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich wiki implementation. Pages use MediaWiki's wikitext format, so that users without knowledge of XHTML or CSS can edit them easily.

MediaWiki - powers Wikipedia

InfoGlue is one of the most advanced, scalable and robust Open Source content management / portal platforms available. InfoGlues increased focus on usability together with flexibility in every area makes it suitable for a wide range of applications and organizations. 
 
 Key features includes JSR-168 support (portlets), full multi-language support, unlimited number of sites in one installation, excellent information reuse, high performance and extensive integration capabilities. It has cross platform support and works with multiple databases. Check out its <A HREF="http://www.infoglue.org/Projects/InfoGlue/Features/" target="_blank">complete feature set</A>. 

 Infoglue family has two additional projects, Calendar and Eclipse IDE integration.

InfoGlue is one of the most advanced, scalable and robust Open Source content management / portal platforms available. InfoGlues increased focus on usability together with flexibility in every area makes it suitable for a wide range of applications and organizations.

Infoglue - CMS and Portal Platform

PmWiki is a wiki-based system for collaborative creation and maintenance of websites. It stores data in the file system and it doesn't require database. It has all required features for a wiki such as Page editing, Page history, Web feed, Email notification for revised page, Navigation trails, Search support, Spam protection and lot more.

PmWiki - PHP based Wiki

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including 
 <UL>
	<LI>Profiles</LI>
	<LI>Social bookmarking</LI>
	<LI>Groups</LI>
	<LI>Activity Streams</LI>
	<LI>Access controls</LI>
	<LI>Blogging / Microblogging</LI>
	<LI>Web Services API</LI>
	<LI>Pages</LI>
	<LI>RSS / JSON</LI>
	<LI>Widgets</LI>
	<LI>Video</LI>
	<LI>Documents</LI>
	<LI>Photo Gallery</LI>
 </UL>

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including Profiles, Groups, Activity Streams, Access controls, Blogging / Microblogging, Web Services API etc.

Elgg

XOOPS is an acronym of eXtensible Object Oriented Portal System. XOOPS is a web application platform written in PHP for the MySQL database. Its object orientation makes it an ideal tool for developing small or large community websites, intra company and corporate portals, weblogs and much more. XOOPS received many awards and concidered to be one among the best CMS. Its features include:
 <UL>
	<LI>Database-driven: XOOPS uses relational databases (currently MySQL) to store data required for running a web-based content management system</LI>
	<LI>Fully Modularized: Modules can be installed/uninstalled/activated/deactivated with a click using the XOOPS module administration system. There are hundreds of modules available for download</LI>
	<LI>Personalization: Registered users can edit their profiles, select site themes, upload custom avatars, and much more</LI>
	<LI>User Management: The ability to search for users by various criteria, send email and private messages to users through a template-based messaging system</LI>
	<LI>Supported World-wide: The XOOPS community has more than dozen official support sites around the world for support of non-English speaking users</LI>
	<LI>Multi-byte Language Support: Fully supports multi-byte languages, including Japanese, Simplified and Traditional Chinese, Korean, etc</LI>
	<LI>Versatile Group Permissions System: Powerful and user-friendly permissions system which enables administrators to set permissions by group</LI>
	<LI>Theme-based skinnable interface: XOOPS is driven by a powerful theme system. Both administrators and users can change the look of the entire web site with just a click of a mouse. There are also over 800 themes available for download</LI>
	<LI>SEO friendly</LI>
	<LI>Email notification system allowing members to be updated instantly of any content changes</LI>
 </UL>

XOOPS is an acronym of eXtensible Object Oriented Portal System. XOOPS is a web application platform written in PHP for the MySQL database. Its object orientation makes it an ideal tool for developing small or large community websites, intra company and corporate portals, weblogs and much more.

Xoops - Web content management system in PHP

BuddyPress provides social networking features to a WordPress. It works well to enable people with similar interests to connect and communicate. It supports Content tagging, Grouping of similar activity stream items, AJAX live updating of site wide activity stream, Message archive, Better XProfile management and lot more. 

Buddypress - Social Networking features in WordPress

Vosao (vo-za) is a content management system (CMS) that enables you to build web sites and online applications on the Google App Engine platform for Java. Vosao CMS features include internationalization, friendly URLS, liking and sharing pages, commenting (with moderation), content versioning, input forms, captcha, Google Analytics, Alias URLs (for SEO), optional plugins, security and group management, parent/child page structure, nested and programmable templates, site import/export, resource management, multiple editing modes (visual, wiki syntax, plain text) and more, along with free hosting on the Google cloud.

Vosao (vo-za) is a content management system (CMS) that enables you to build web sites and online applications on the Google App Engine platform for Java.

VosaoCMS - simple CMS for Google App Engine

jCore is a Multi Site web Content Management System build especially for webmasters (using the well known LAMP environment) who have to maintain multiple websites for their clients and they would like to keep the source codes up to date and easily fix bugs for all clients at once. Its feature include Dynamic Web 2.0 Layout, Forms, Multiple Menus, Members Management, RSS Feeds, jQuery support and lot more.

jcore - Webmaster Multisite CMS

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