Document Management Solution?

Hello,

I have to implement a solution on Document Management for our department
of 100
to 200 people. Currently we use Documentum and since I have been allocated
budget, I can either continue with Documentum or move on to different
product. I
want to first check out open source solutions, before venturing into any
close-ended
solutions. So, if you know of any, please let me know.


Sundar