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Design & ValidateToolOpen sourceFree
Gaphor
An open UML, SysML, RAAML, and C4 modeling application with editable models, reusable elements, diagrams, and exports rather than a drawing-only canvas.
Visit official siteContent record updated Aug 1, 2026Official site reached automatically · Checked Aug 3, 2026
Why it’s here
Technical designers can keep component, interface, and relationship semantics consistent across diagrams for game-client and service architecture.
Best fit
Prototype systems, stories, and interactions, then validate them with real players.
technical-designarchitecture
Before you commit
Formal modeling requires shared notation and granularity, and over-modeling slows small projects; live collaboration and code generation are not its primary strengths.
