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 users' needs.
The project has been running since 1999.
Dave Hall Consulting was one of the driving forces behind the phpGroupWare for many years and led it from 2004 until 2009. During this time we contributed to many modules, including core, calendar, sitemgr, addressbook, projects and property. DHC also mentored 2 Google Summer of Code program students working on phpGroupware for the GNU project.
Project Website: http://phpGroupWare.org