Looking for an open source web based software for project management

[Erez D]

Hi

I am using Trac. it is a nice wiki+bugtraq system, however i would like to
have dependencies among tasks, to have time estimates to tasks, and get a
total time estimate for a task+ it's dependencies.
something like a merge of MS project and Trac.

I know there are great open source projects, which have hundreds and
thousands of people contributing, and i do not believe they use only poor
management systems

So i ask:
Does anybody knows of such a software ?

Thanks,
Erez.
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