Open source gems

Excalidraw

An open source whiteboard for sketchy diagrams, quick architecture maps, and collaborative visual thinking.

Open original
Pricing
Free
Login required
No
API available
No
License
Open-source license; verify the project repository.
Last checked
2026-07-08

What 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

  1. Draw one messy version first, then group related objects.
  2. 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.

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