Tools to Draw Diagrams programmatically

TikZiT is a graphical tool for rapidly creating graphs and string diagrams using PGF/TikZ.

Creates diagrams from textual descriptions! It provides a unified API with support for BlockDiag, BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, GraphViz, Mermaid, Nomnoml, PlantUML, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom