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Design & ValidateToolOpen sourceFree
diagrams.net
An open-source browser and desktop diagramming tool for state machines, architecture, level logic, and data relationships.
Visit official siteContent record updated Jul 31, 2026Official site reached automatically · Checked Aug 3, 2026
Why it’s here
Files can stay local and enter version control, which suits small teams that need control over data location.
Best fit
Prototype systems, stories, and interactions, then validate them with real players.
technical-designgame-design
Before you commit
Real-time workshops are less fluid than dedicated whiteboards, and complex diagrams still need a shared notation.
