Sure, Visio is awesome.

But what about these open source self-hostable alternatives?

You may want to check by yourself: Excalidraw, Draw.io.


  1. Excalidraw

    Virtual whiteboard for sketching hand-drawn like diagrams

    ★ 87.7k Diagram Whiteboard License: MIT

    An open source virtual hand-drawn style whiteboard. Collaborative and end-to-end encrypted.

    preview

  2. Draw.io

    JavaScript, client-side editor for general diagramming

    ★ 51.3k Diagram License: Apache-2.0

    Browser-based diagramming components and applications.