Taskserver and Taskwarrior
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Taskserver allows users to synchronise their Taskwarrior instances across multiple locations.
https://tasktools.org/projects/taskd.html
I had also thought perhaps to add a WebUI as well, but it looks like the two I know of are now un-maintained which might be an issue:
https://github.com/theunraveler/taskwarrior-web
https://github.com/rampantmonkey/twui
Inthe.am kind of provides the idea. I don't know if this is too much work, because it looks like more than just packaging Taskserver and Taskwarrior:
Actually just noticed Inthe.am is open source anyway. Perhaps it's possible just to package that.