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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 updated Jul 31, 2026Automated check reached the official site · Checked Aug 24, 2026
Why use it
Files can stay local and enter version control, which suits small teams that need control over data location.
Where it fits
Use prototypes and playtests to find core experience problems while they are still cheap to fix.
technical-designgame-design
What to check
Real-time workshops are less fluid than dedicated whiteboards, and complex diagrams still need a shared notation.
