egroupware

eGroupware is an open source groupware suite designed to help teams collaborate efficiently. It provides web-based tools for calendars, contacts, email, tasks, file management, and project management. The platform is highly modular, allowing administrators to enable only the features their organization needs. It can serve as a central hub for communication and document sharing, making it suitable for intranets and team workspaces.

Written in PHP and using a database backend (MySQL, PostgreSQL, or SQLite), eGroupware runs on Linux, Unix, and Windows servers. It includes a site manager for building structured web pages, a wiki, a knowledge base, and support for WebDAV and CalDAV/CardDAV sync. The software integrates with email servers via IMAP and can synchronize with mobile devices using ActiveSync. It also offers a REST API for custom integrations.

eGroupware is developed by EGroupware GmbH and released under the GNU General Public License v2. It is a mature project with over 20 years of history, used by organizations worldwide. Pricing is free for the community edition, with enterprise support subscriptions available. It is ideal for small to medium businesses and educational institutions looking for a self-hosted collaboration solution.