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Please suggest only those that you have actually used and state why you think it's the best.
This question is marked "community wiki".
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It's been a long time since I last used a UML tool but the free one I can recommend for Windows is JUDE UML. As far as I can remember, it was very simple to use. UPDATE: It looks like JUDE free has been changed to Astah Community.
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This answer is marked "community wiki".
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