Penpot
penpot.app
Open-source design and prototyping
ToolsOpen sourceWebSVG
by Kaleidos
Excalidraw
Hand-drawn style diagrams
Live site
excalidraw.com
Preview Excalidraw inline
Loads the real site in a frame. Some sites block embedding — if it comes up blank, use Open instead.
What it is
The sketchy aesthetic keeps diagrams feeling provisional, which is exactly right for architecture discussions. Also embeddable as a React component.
Get started
terminal
Tags
diagramsopen-sourceembeddable