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I used to use one years ago called yEd graph editor. Supremely amazing. It is free to use, but I don’t think it’s open source.
Inkscape works well for this.
Does inkscape have diagram connecting? One of the best draw.io features is the wide array of premade shapes, styles, and auto connecting for flow visualization
Unless I misunderstand your question, draw.io can be downloaded as a standalone Linux application and run locally.
Likewise, the Xfig package should he available in most Linux repos. It’s old, but good enough for a quick sketch.
edit: aha. My mistake. My eyes slid over ‘open source’ in the title*, and even still I hadn’t realized it was an Apache license.
* Whaaat, it was pre-coffee? Let the purest among us cast the first stone.
draw .io is closed source.
Source available*
They’re looking for something open-source. Draw.io’s readme says:
I haven’t been through the license to see what its restrictions are, but there must be a reason they give this warning.
Of the changes made last week to the license, this one stands out:
That is a weird carve-out, so I’d guess the license revision (and technically the reason it’s no longer open source) somehow has to do with Atlassian or their plugin marketplace?
I guess that’s how they make a lot of money, selling their own Confluence plugin.
From another comment on this thread: https://github.com/jgraph/drawio/discussions/4623
You are aware that draw.io is itself open source and self-hostable: https://github.com/jgraph/drawio ?
“This project is not an open source project as a result.”
https://github.com/jgraph/drawio/blame/dev/LICENSE <-- that’s … a rather specific and recent change. Is there a story here ?
Weird because gliffy (or whatever it’s called) exists on confluence
They added:
Amazing. I get there’s some atlassian bullshittery behind that.
Looks like their paid confluence extension was called a scam in a review and they really did not like that 😂 https://github.com/jgraph/drawio/discussions/4623
By no means the best option, but the tikz latex package works and pandoc can handle the conversion to your preferred format. I would limit this to very simple diagrams.
D2lang is good
https://gaphor.org/
https://wiki.gnome.org/Apps/Dia
I’ve used Dia for years, great simple tool for diagramming & if I need something more I’ll switch to graphviz dot files
planuml
LibreOffice Draw?
Maybe mermaid fits your use case?
https://mermaid.js.org/
See also Inkscape.
Doesn’t quite fit OPs want of self hosted, but still very good.
There is also Asymptote and tikz for more technical stuff.
There’s kroki as well, which includes Mermaid, Excalidraw, GraphViz, PlantUML, etc.
Graphviz
Draw.io has a Docker container
https://www.drawio.com/blog/diagrams-docker-app
Yed is pretty good. It’s what I use.
What kind of diagram are you going to make?
graphviz