Debian packages for cool open source collaboration tools?

[Rogelio <scubacuda@gmail.com>]

I'm looking for open source collaboration and project management tools, 
preferably already packaged in deb or apt-get.

Ideally, I'd like to build my own internal resources like Google Docs, 
Meeting Wizard, Etherpad, etc.  I'd like the idea of having them secure 
and free *internal* resources.

Any advice on projects I should look into?  Any and all suggestions 
would be greatly appreciated!