Groupware bem organizado. A instalação é meio chata, mas o instalador funciona direitinho.

Site Oficial
egroupware.org
eGroupWare is many things. It is a very flexible pluggable framework capable of hosting applications like a group calendar, AddressBook, Email, accounting ledger, inventory, and whatever else your can think of. These applications can share a common user store, and a flexible Access Control List (ACL) system to control access and information sharing. At it's core there is the phpgwapi, an API written for php, that provides some very useful functions and tools for developers, including the user store, which has several back ends, database abstraction, and a flexible templating system. Applications are then written using the phpgwapi and phpgw framework to provide web based tools to users. More information can be found at eGroupWare Applications or our homepage http://www.egroupware.org/

Meu teste do eGroupware
http://sememprego.dtdns.net/weblivre/egroupware/

Para entrar na área de administração:
Username: admin
Senha: demo

Por favor, não faça muita bagunça... Não quero ficar limpando o site toda hora.

O site de teste está hospedado em um servidor precário... Se ficar muito tempo fora do ar, por favor escreva para weblivre@br101.org. Vc pode/deve tentar usar os cms instalados no opensourcecms.com. Lá tem muito mais opções do que aqui. :)