A turnkey open source messaging and collaboration platform.

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.

Groupware suite containing a base system and different modules including scheduler, email, file and projects. (PHP)

A planned PHP-based groupware including calendar, address book, forum, ticket system, WebMail, CRM and DMS.

Web-based open source groupware written in Java/JSP with support for PostgreSQL, Oracle and SQL Server.

Lucane is a free groupware platform written in Java, designed with extensibilty in mind.

Topic Map based java system, "a testbed for developing tools for Web collaboration", Apache license.

OpenACS (Open Architecture Community System) is an advanced toolkit for building scalable, community-oriented web applications.

Web based groupware providing group scheduling, addressbooks, shared folders.

Groupware and content management system developed in Ruby on Rails. Web site includes news, documentation and an online demonstration.