Sure, Lucidchart is awesome.

But what about these open source self-hostable alternatives?

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


  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.

  3. Mermaid Live Editor

    Edit, preview and share mermaid charts/diagrams

    ★ 4.4k Diagram License: MIT

    Edit, preview and share mermaid charts/diagrams.

    Features

    • Edit and preview flowcharts, sequence diagrams, gantt diagrams in real time.
    • Save the result as a svg
    • Get a link to a viewer of the diagram so that you can share it with others.
    • Get a link to edit the diagram so that someone else can tweak it and send a new link back