Open source gems
Excalidraw
An open source whiteboard for sketchy diagrams, quick architecture maps, and collaborative visual thinking.
Open originalWhat it is
Excalidraw keeps diagrams informal enough that people are willing to edit them, which is often the point.
Why worth a look
An open source whiteboard for sketchy diagrams, quick architecture maps, and collaborative visual thinking.
Good for
- Explaining an idea before turning it into a polished diagram.
- Sharing rough architecture or product flows quickly.
How to start
- Draw one messy version first, then group related objects.
- Export a PNG only after the discussion settles.
Best first click
Open Excalidraw and start here: Draw one messy version first, then group related objects.
Trust facts
- Pricing
- Free
- Login required
- No
- Open source
- Yes
- API available
- No
- License
- Open-source license; verify the project repository.
- Risk
- Pricing, login requirements, and availability can change; last human check: 2026-07-08.