Gaphor is an easy to use UML modeling environment written in Python. Gaphor has an UML 2.0 compliant data model. It's design is very extensible.

Changes since 0.5.0
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- Fixed a bug in the installation procedure

Important changes for 0.5.0
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- Support for Stereotypes,
- Support for UseCases,
- Plugins
- Packages can be reordered by drag-and-drop,
- Support for Interfaces