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Review of TopCoder UML Tool powered by the Slant community.
More advanced than Violet UML Editor. Supports XMI, XML, ZUML and TCUML formats as input and GIF, JPEG, PNG, PNM and TIFF as export.
SpecsUpdate
PlatformsWindows, Linux, Mac
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Pros
Pro Open Source
The Java source code is available on GitHub.
Pro Code generation
Can do some Java and C# code generation.