Mermaid

Mermaid is an open-source JavaScript-based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify diagrams dynamically. It supports various diagram types including flowcharts, sequence diagrams, class diagrams, state diagrams, gantt charts, and more. Developers can integrate it into documentation, wikis, or custom web applications to maintain version-controlled visual documentation without needing external graphic editing software.