Gaphas is a library that provides the user interface component (widget) for drawing diagrams. Diagrams can be drawn to screen and then easily exported to a variety of formats, including SVG and PDF.

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UML typically fits well for software-focused design. Modeling Requirements: Capture requirements, behavior, and constraints with SysML, which offers requirements and activity flow diagrams.

Workflow/State Machine Engine written in modern C++. Offers a comprehensive DSL (Domain Specific Language) for UML state machines. Comes with a runtime to run, trace and visualize your state machines.