Free collaboration software for linux

Mindquarry Collaboration Server is a set of well proven professional collaboration tools made easy to be usable for everyone.
This enables you to streamline your work and become more efficient, productive and creative.
Mindquarry is free software. Mindquarry is Open Source Software, meaning you can download, use and redistribute it free of charge.
Mindquarry supports teamwork. Mindquarry allows you to share files, exchange ideas and definitions, manage tasks for yourself and your team, and organize talk via e-mail, instant messenger or real-world meetings.
Main features:
Files
The Mindquarry File manager stores snapshots of documents edited by your team and makes them searchable. It allows two people to modify a document at the same time.
Wiki
Knowledge management is essential in a world of constant change and expanding information reservoirs. The Mindquarry Wiki allows teams to share documents, ideas, thoughts and definitions. It is like a personal Wikipedia for your team.
Tasks
The first part of task management is organizing what you have to-do, what you have done and what you will do. The second part organizing the tasks for all team members and exchanging task information.
Enhancements:
- An issue where SVN URLs were not in the correct format under Windows was fixed and long with a problem where the check for unique email address upon changing a profile included the current user, so changing the profile a second time with the same email address did not work.
- This release also fixed problems where task dependencies were not reloaded until restart, nested lists in wiki were not in the correct format for xsl:fo, output encoding for JSON was not set to UTF-8, lots of Dojo errors appeared when scrolling after wiki save, and the AutoSize on resize handler was not removed.

OfficeSpot.Net CS contains following packages: - eGroupWare - OpenLDAP - DBMail - ClamAV - APC - Memcache - MySQL
Enhancements:
- This release contains updated versions of eGroupWare (1.4), DBMail (latest stable SVN revision), and ClamAV (0.90.3).
- The installation process was streamlined and the online documentation was updated.

Zimbra Collaboration Suite project is a client/server technology for enterprise messaging and collaboration.
Zimbra delivers innovation for both the administrator and the end-user as well as compatibility with existing infrastructure and applications (both open source and proprietary).
The Zimbra Collaboration Suite provides support for email, contacts, and group calendaring, and consists of a server and client.
Main features:
Administrator Benefits
- Online move, backup and recovery of individual or a group of mailboxes
- Compatibility with Active Directory and existing LDAP directories
- Native hierarchical storage management and clustering
- Web services integration with existing enterprise applications
- Integrated anti-spam and anti-virus
End-User Benefits
- Browser based client with search, shared calendar and mail that is integrated with contacts and calendar
- Support for Outlook: calendar, mail, contacts and offline mode
- Support for mobile devices: Blackberry, Treo and etc
- Support of Windows, Apple and Linux computer.
Whats New in 5.0.0 Beta 1 Development Release:
- This is the first release in the 5.0.0 release cycle.
- New features include IM, Tasks, Standard Client autocompletion, and keyboard navigation.
- Updates have been made to migration wizards and apple/outlook connectors.
Whats New in 4.5.6 Stable Release:
- Support for an automated MySQL database corruption check that will send a notification to the admin.
- Spam training has been enhanced by allowing programmatic scanning of folders without requiring a password.
- Admins can get backup and restore complete notifications sent via email.
- .Doc and .pdf files open correctly in Zimbra Web Client.
- iSync will not duplicate the calendar, and iSync Connector works correctly with Mac OS X 10.4.10.
- Servers automatically start after a ZCS upgrade.
- Web-based cross-mailbox discovery is available for the optional Zimbra Archiving and Discovery module.

Apache Graffito provides a framework used to build content-based applications.

Graffito is a framework used to build content-based applications like CMSs, document management systems, forums, blogs, etc. It offers a complete platform for creating, managing, and publishing content in your portal or in any other kind of Java application.

It integrates content repositories, workflow, collaboration, and personalization via existing open source projects and standards like WEBDAV.

The Klorofil Collaboration Project, which initiated and sponsored by Saltanera Teknologi, is an open source initiative through which the Klorofil community and industry partners will together build a new PHP enterprise-level application development and deployment environment.
Klorofil project is an open source project initiated by Saltanera Teknologi, an e-business solution provider company.
The goal of the project is to build a new PHP enterprise-level application development and deployment environment. One of Klorofils product is an open source platform for PHP named as Klorofil Platform.
Klorofil Platform is an open source project made available by Saltanera under Common Public License version 1.0 ("CPL"). CPL is an open source license which has been approved by Open Source Initiative.
Klorofil Platform Basic Structure:
- Class Registration
- Application Launcher
- Collection Classes
- I/O Classes
- Network Classes
Socket
HTTP
Email
SMS
- Compression
- Byte Compiler
- XML
gambArt (Klorofil GUI)
Basic Structure
- Application
- Canvas
- Component
- Control
- Form
Component
- Button
- Flat Button
- Label
- Edit
- Dialog
- Radio Button
- CheckBox
- Panel
- Image
- ListBox
- DropDownBox
- PageControl
- ToolBar
- MainMenu
- Timer
Enhancements:
- Bug fixed on Windows launcher to use php.ini file from klorofils directory
- Bug fixed on Calculator samples, button 9
- Enhancement of memory allocation model for event handler, not every component handling event
- Enhancement of receive focus process of control, not every control accept focus

Coefficient is a scalable open source project based collaboration platform that can run in J2EE and web application containers.

It currently provides basic collaboration tools as hot deployable modules. It also provides a workflow engine to help guide projects through their development cycle.