Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag, PacketDiag, RackDiag), BPMN, Bytefield, C4 (with PlantUML), D2, DBML, Ditaa, Erd, Excalidraw, GraphViz, Mermaid, Nomnoml, Pikchr, PlantUML, Structurizr, SvgBob, Symbolator, TikZ, UMLet, Vega, Vega-Lite, WaveDrom, WireViz... and more to come!

• Kroki!
• GitHub - vegavega A visualization grammar.
• Documentation Vega
• Example Gallery Vega
• Vega Editor
• Editor Mermaid Chart

Eclipse Sprotty is an open-source project enabling the creation of powerful diagramming tools and graphical visualizations.

• GitHub - eclipse-sprotty/sprotty A diagramming framework for the web
• Introduction Sprotty