@antv/x6
JavaScript diagramming library that uses SVG and HTML for rendering
gojs
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
nomnoml
The sassy UML renderer that generates diagrams from text
markdown-it-textual-uml
Markdown-it markdown parser plugin to create uml diagrams from text, based on plantuml, mermaid, etc.