Gaphor is a UML, SysML, RAAML, and C4 modeling application. It is designed to be easy to use, while still being powerful. Gaphor implements a fully-compliant UML 2 data model, so it is much more than a picture drawing tool. You can use Gaphor to quickly visualize different aspects of a system as well as create complete, highly complex models.
Gaphor provides four modeling languages: UML, SysML, RAAML and C4 and makes them accessible to beginners.
Gaphor is designed around the following principles:
- Simplicity: The application should be easy to use. Only some basic knowledge of UML or SysML is required.
- Consistency: UML is a graphical modeling language, so all modeling is done in a diagram.
- Workability: The application should not bother the user every time they do something non-UML-ish.
This is free and open source software.
Website: github.com/gaphor/gaphor
Support:
Developer: The Gaphor Development Team
License: Apache License v2.0

Gaphor is written in Python. Learn Python with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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