Online collaboration

[Mord Behar]

Hi
I'm looking for an open source solution for collaborating on various tasks,
mostly graphics related.
I have access to a LAMP stack, so installing server-side software shouldn't
be a problem.
The problem is, I don't know what software we need.
We need to have a repository of data, where people can upload and download
the work they've done. It needs to be tracked and (automatically)
documented. It also needs to have a good user-facing interface, the people
using it will be graphics designers, not programmers.
Any ideas?
Thanks.
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