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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don’t control.
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Resources:
selfh.st Newsletter and index of selfhosted software and apps
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.