posted 15 years ago
I think you are asking for open source and free tools only.
Other then Argo and Star UML i don't know any other good UML tools.
But If you are looking for free ,then i think take a look at Poseidon for UML - Community Edition.
Personally, i do not use any tools, i tried and it takes lot of efforts for synchronizing it with code[ and funny part is you have to manually cross check it, because it may get wrong] as we don't have any time[it is also because we are not huge team, as we are working in same room.]. But i kept few major high level diagrams.
Before software can be reusable, it first has to be usable. - Ralph Johnson