Gaphor

Gaphor is a modeling application for creating UML and SysML diagrams on Linux. It provides a workspace for describing software structures, system components, behavior, and relationships with standard modeling notation. The application is intended for users who need diagrams that are more formal than general drawing files, such as class models, state models, use-case views, and system architecture sketches.

The program focuses on model elements rather than only shapes on a canvas. Users add items to a diagram, connect them, and organize them as part of a shared model, so different views can represent related parts of the same design. Gaphor is distributed under the Apache-2.0 license and is published by Arjan J. Molenaar. The available platform information here is limited to Linux.