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Dia

Honorable mention

Structured diagram editor for flowcharts, ER diagrams, network maps, and UML-style shapes with export to many formats.

diagramflowchartumltechnical

Graphics & Design

Asymptote

Also strong

Vector graphics language for technical drawing: LaTeX integration, 3D, C++-like syntax for publication figures.

vectortechnicallatexdiagramcode

Graphics & Design

Ipe

Honorable mention

Extensible drawing editor for creating figures in PDF/EPS/SVG with LaTeX labels and geometric constraints.

vectorpdflatexacademicdiagram