MoreGroupware
- Moregroupware is a Web-based Groupware written in PHP4. Includes modules like calendar, notes, todo, and contacts. It is database abstracted and uses a template engine for output.
- http://www.moregroupware.de/

JetSpeed [from Apache's Jakarta]
- A servlet implementation of an open protocol GroupWare product. Backend (search engines, news, weather, POP3/IMAP/LDAP/NNTP, database) is based on other open source packages.
- http://portals.apache.org/jetspeed-1/

TWIG
- A useful intranet/groupware tool and application framework. Written and implemented with PHP. Goal is to be a simple, cross-platform, fast way to access/share almost any kind of information, GPL license.
- http://www.informationgateway.org/

DOE2000 Electronic Notebook
- Modular, extensible, notebook framework to make cross-platform interoperating prototype implementations. Allows shared input and display of sketches, text, equations, images, graphs, other data types. Tools for authentication, other services.
- http://www.csm.ornl.gov/enote/

GroupSuite
- A planned PHP-based groupware including calendar, address book, forum, ticket system, WebMail, CRM and DMS.
- http://sourceforge.net/projects/groupsuite/

Lucane
- Lucane is a free groupware platform written in Java, designed with extensibilty in mind.
- http://lucane.org/

Hipergate
- Web-based open source groupware written in Java/JSP with support for PostgreSQL, Oracle and SQL Server.
- http://www.hipergate.org/

XenIntranet
- A modular intranet/extranet solution based on the Ampoliros PHP web applications platform and taking advantage of Ampoliros features. GNU license.
- http://www.xenintranet.com/

Isogest Your Office in a Box
- A web-based Italian office communication suite for archiving digital documents. Works with Hylafax server.
- http://isogest.sourceforge.net

OpenACS
- OpenACS (Open Architecture Community System) is an advanced toolkit for building scalable, community-oriented web applications. If you're thinking of building an enterprise-level web application, OpenACS is a solid, proven foundation that will give you a
- http://openacs.org

Outreach Project Tool
- GPL PHP groupware package targeted at project development. Manages documents, tasks, requests, basic newsletters, knowledge entries, stores e-mail copies, e-mail repository address. Requires LAMP.
- http://sourceforge.net/projects/outreach

WEBO - Web based groupware
- Web based groupware providing group scheduling, addressbooks, shared folders.
- http://sourceforge.net/projects/weborganizer

PHProjekt
- Open source groupware with calendar, project management, request tracker and 12 other modules. Supports more than 16 languages. Requires mysql, oracle, postgres or informix db.
- http://www.phprojekt.com/

GNA - Frontdesk
- A distributed group e-mail application for software/helpdesk functions, GPL license.
- http://www.gnacademy.org/uu-gna/tech/dbedit/frontdesk.html

onShore
- onShore, a consulting firm, has a web-based, multi-user time-billing tool, GPL license.
- http://www.onshore.com/

Nexist
- Topic Map based java system, "a testbed for developing tools for Web collaboration", Apache license.
- http://nexist.sourceforge.net

phpGroupWare
- A multi-user web-based groupware suite written in PHP. It also provides an API for developing additional applications.
- http://www.phpgroupware.org

MetaDot Open Source Portal Server
- Free Open Source Portal Server allowing point and click community, content and XML syndication management on the Web, email, cellphone, other media.
- http://www.metadot.com/