Zensical

Mermaid

mermaid-js/mermaid

Popular

Markdown-like syntax for flowcharts, sequence and ER diagrams rendered natively by GitHub, GitLab and Notion.

draw.io

jgraph/drawio

Popular

Free diagramming app (diagrams.net) for architecture and flow diagrams, with desktop, web and IDE integrations.

Excalidraw

excalidraw/excalidraw

Trending

Hand-drawn style virtual whiteboard, also embeddable as a React component.

PlantUML

plantuml/plantuml

Long-standing text-to-diagram tool for UML, C4 and many other diagram types, common in enterprise docs.

D2

d2lang/d2

Rising

Modern declarative diagram scripting language with multiple layout engines and polished themes.

Docusaurus

meta/docusaurus

Popular

React-based documentation site generator from Meta with versioning, i18n and MDX; a docs-site staple.

Starlight

withastro/starlight

Trending

Astro-based documentation theme with built-in search, i18n and accessibility; very fast and fully static.

Material for MkDocs

squidfunk/mkdocs-material

Legacy

Hugely popular MkDocs documentation theme, now in maintenance mode as its authors move to Zensical.

VitePress

vuejs/vitepress

Trending (detected automatically)

Vite and Vue powered static site generator, the go-to for fast technical documentation.