UML Software

I've been searching from some good Open-source UML software. I need it for class diagrams, use case diagrams, sequence diagrams, collaboration diagrams and statechart diagrams.

I've been searching around and in about 50 posts on stackoverflow, I see 50 different responses. Which ones do you use?
closed account (z05DSL3A)
I gave up trying to find good open-source (or even inexpensive) UML software. The closest I have got to finding something I like is Sparx Systems Enterprise Architect.
Lucidchart.com is pretty sweet.
closed account (S6k9GNh0)
I gave up using UML...

Doxygen can actually generate charts for your code structure.
I've seen Doxygen, and do like it. I'm trying to get through a formalized design phase on a project and wanted to do it from the top-down. I'm using Astah* right now as an evaluation.
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