phpGroupWare (formerly known as webdistro) is a multi-user groupware suite written in PHP.

It provides a Web-based calendar, todo-list, addressbook, email, news headlines, and a file manager. The calendar supports repeating events. The email system supports inline graphics and file attachments.

The system as a whole supports user preferences, themes, user permissions, multi-language support, an advanced API, and user groups.

The Open-Xchange Collaboration and Integration Server Environment allows you to store appointments, contacts, tasks, emails, bookmarks, documents and many more elements and share them with other users. This environment can be accessed via any modern web browser and multiple fat clients like KDE Kontact, Ximian Evolution (announced), Konqueror, Mozilla Calendar and many more. Every 3rd party product can access this application over many different interfaces like the WebDAV interface (XML), LDAP, iCal and HTTP(S). This makes the Open-Xchange application to a powerful product which can be used in many of different business and private areas.

Scalix Community Edition is a free, unlimited use, award winning email and calendaring platform. It includes a full version of Scalix's industrial-strength server and Scalix Web Access (SWA), a revolutionary cross-browser, cross-platform web client that delivers desktop-grade functionality never seen before in a web application. SWA, hailed as the most advanced web mail and calendaring client in the market, makes Community Edition a unique and compelling offering for any organization.

ICEcore is the first Open Source project to fully integrate team workspaces and real-time conferencing in a single, integrated collaboration environment. It provides all the tools knowledge workers demand most -- blogs, wikis, discussion threads, workflow, document management, file stores, RSS feeds and more. ICEcore helps organizations achieve true collaboration and transform social networking into a competitive advantage.