flowcharts

Mermaid

MermaidOpen

Text-defined diagrams: flowcharts, sequences, and Gantt in Markdown

Mermaid is a JavaScript tool that renders Markdown-inspired text into flowcharts, sequence diagrams, and Gantt charts, rendered natively in Markdown hosts such as GitHub.

draw.io

draw.ioOpen

Security-first diagramming online, on desktop, or self-hosted

draw.io is a free diagram editor for flowcharts, network diagrams, and whiteboards that runs in the browser, on the desktop, or self-hosted.