• http://www.phpgroupware.org/

phpGroupWare is a fully featured, web based messaging, collaboration and enterprise management platform.

phpGroupWare comes with over 50 applications that can be mixed and matched according to your needs. Some of the most powerful features we offer include:

    * Contacts management
    * Email
    * Shared calendar
    * Web content and document management and sharing
    * Project management
    * Issues tracking