Rappid diagramming toolkit

Rappid, a complete diagramming toolkit, is a commercial extension to JointJS that implements all kinds of UI and other features making it easy to rapidly create visual tools of various kinds.
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JointJS Core demos

Finite State Machine demo Org Charts demo Entity-relationship Diagrams demo Discrete Event System Specification demo Chess demo Petri Nets demo Links demo UML Class Diagram demo UML StateChart Diagram demo Logic Circuits demo Smart Routing demo Paper Attributes demo