Zimbra is the most capable open source email and collaboration suite available today. It provides support for Email, Shared calendar, Document management, Pop3, Address book and lot more. Mails could be tagged and search support is also provided. Zimbra is considered as an alternative to Microsoft Exchange Server.

Zimbra - Email and Collaboration Suite

LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.
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A rich set of APIs is available for integration with third-party applications via webservice. On the website of LogicalDOC you can also download the commercial version of the software with a set of additional features.
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<img src="/AppImages/Article/logicaldoc-screenshot_sm.png" alt="" class="float-left">

LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.

LogicalDOC Document Management - DMS

Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling,  
  Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support. <BR><BR>Its features include: <BR>
  <ul>
<li class="level1"><div class="li"> Email, calendaring, address books, bulletin boards, instant messaging, and more &hellip; all in <strong>one</strong> tightly integrated server package. Unlike other open source groupware systems, <strong>all of Citadel&#039;s data stores are built-in.</strong> All that tedious mucking about with dependencies and config files is a thing of the past.   </div>
</li>
<li class="level1"><div class="li"> High-performance, multiprotocol, multithreaded server engine   </div>
</li>
<li class="level1"><div class="li"> Web browser, telnet/<acronym title="Secure Shell">SSH</acronym>, local client software accessible   </div>
</li>
<li class="level1"><div class="li"> Standards-compliant e-mail built in: <acronym title="Internet Message Access Protocol">IMAP</acronym>, <acronym title="Post Office Protocol 3">POP3</acronym>, <acronym title="Extended Simple Mail Transfer Protocol">ESMTP</acronym>   </div>
</li>
<li class="level1"><div class="li"> Group calendaring and scheduling (<a href="http://www.groupdav.org" class="urlextern" title="http://www.groupdav.org">GroupDAV</a> and Kolab-1 compatible)   </div>
</li>
<li class="level1"><div class="li"> Built-in listserv (mailing list server)</div>
</li>
<li class="level1"><div class="li"> Integrated server-side mail sorting and filtering.  Users can choose between an easy-to-use web based rules editor, or the power of writing complex scripts using the industry standard Sieve language.</div>
</li>
<li class="level1"><div class="li"> <a href="http://bionicmessage.net/index.php?q=node/11" class="urlextern" title="http://bionicmessage.net/index.php?q=node/11">Support for push e-mail and mobile devices</a></div>
</li>
<li class="level1"><div class="li"> Database-driven, single-instance message store</div>
</li>
<li class="level1"><div class="li"> Built-in full text index for fast searching</div>
</li>
<li class="level1"><div class="li"> Authenticated <acronym title="Simple Mail Transfer Protocol">SMTP</acronym> for remote email submission</div>
</li>
<li class="level1"><div class="li"> Multiple domain support   </div>
</li>
<li class="level1"><div class="li"> Built-in integration with perimiter email filtering technologies such as Realtime Blackhole Lists (RBL&#039;s), <a href="http://spamassassin.apache.org/" class="urlextern" title="http://spamassassin.apache.org/">SpamAssassin</a>, and <a href="http://www.clamav.net" class="urlextern" title="http://www.clamav.net">ClamAV antivirus</a></div>
</li>
<li class="level1"><div class="li"> Server-to-server replication. Users in any number of domains can be spread out across any number of Citadel servers, allowing you to put data where you need it, and enabling infinite horizontal scalability.   </div>
</li>
<li class="level1"><div class="li"> Web-based access to email, calendars, and everything else through a powerful <acronym title="Asynchronous JavaScript and XML">AJAX</acronym>-style front end   </div>
</li>
<li class="level1"><div class="li"> Very strong support for “public folders” and message forums.   </div>
</li>
<li class="level1"><div class="li"> Built-in instant messenger service   </div>
</li>
<li class="level1"><div class="li"> <acronym title="Secure Sockets Layer">SSL</acronym>/TLS encryption for all protocols   </div>
</li>
<li class="level1"><div class="li"> Citadel is <em>true open source</em> software.  Unlike other groupware servers, it isn&#039;t a cut-down version of an expensive proprietary “pro” version.  We make our very best work available to everyone on the same terms.  100% of our code is covered by the GNU General Public License (GPL3).</div>
</li>
</ul>

Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.

Citadel

Tiki Wiki CMS Groupware is a full-featured, web-based, multilingual (35+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware using PHP, MySQL, Zend Framework, jQuery and Smarty. Actively developed by a very large international community, Tiki can be used to create all kinds of Web applications, sites, portals, knowledge bases, intranets, and extranets.<BR><BR>It has support of wiki, forum, Blog, Articles, Image gallery, map server, link directory, Bug tracker and lot more.

Tiki Wiki CMS Groupware is a full-featured, web-based, multilingual (35+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware using PHP, MySQL, Zend Framework, jQuery and Smarty. Actively developed by a very large international community, Tiki can be used to create all kinds of Web applications, sites, portals, knowledge bases, intranets, and extranets.

Tiki Wiki CMS Groupware

Kopano Core provides the foundation for groupware messaging enabling clients such as Kopano WebApp, Kopano DeskApp, mobile and sync clients. With its modular architecture, Kopano Core enables the possibility for a variety of setup scenarios, scalable from a very low-powered system to a multi-datacenter setup providing messaging capabilities to tens of thousands of users.
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Kopano Core provides all traditional groupware functionality with e-mail, advanced calendaring, contacts, tasks and notes. With full support for ACLs, public folders, delegation, enterprise search and much more, Kopano Core is perfectly suited for usage as messaging platform with professional needs in communication. The native implementation of MAPI allows conversion-less interoperability providing its rich feature-set to a broad range of clients, including mobile integration.


Kopano Core provides the foundation for groupware messaging enabling clients such as Kopano WebApp, Kopano DeskApp, mobile and sync clients. With its modular architecture, Kopano Core enables the possibility for a variety of setup scenarios, scalable from a very low-powered system to a multi-datacenter setup providing messaging capabilities to tens of thousands of users.

Kopano - Collaboration made easy

Kolab is a secure, scalable and reliable groupware server. Kolab helps to manage Email, Calendar, Contacts. It comes with a File Cloud and an advanced Task Management Module. 

Kolab - Groupware Server

WebTop is a Web2.0 application platform. It provides WebTop Services as the development framework and WebTop Groupware as a full featured bundle of services that form an Enteprise Cloud Collaboration solution with Mail, Calendar, Contacts and more. 
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WebTop Services consists of a rich Web2.0 developement framework based on ExtJS/Java, with prebuilt key functionalities to allow for a quick and easy implementation and deployment of applications in the form of services available inside a Web Desktop. Its key feature include  authentication, profiling, access control to services, layout, session management, server events polling, internationalization, themes customization and more.


WebTop is a Web2.0 application platform. It provides WebTop Services as the development framework and WebTop Groupware as a full featured bundle of services that form an Enteprise Cloud Collaboration solution with Mail, Calendar, Contacts and more. 


WebTop - Enterprise Collaboration suite

SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

SOGo - Fast and scalable modern collaboration suite (groupware)

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