There are plugins for UML, dot, etc., but I couldn’t find one that allows me to create system diagrams. Any pointers?
The ideal plugin would be something based on mxGraph (using its xml notation) because then it can be modified through draw.io (it seems that the github source code can even be used inside tiddlywiki: https://github.com/jgraph/drawio). If none exists, I might try to create one, but it’ll take me time as I’ve never created a plugin.
It is maintained, but it’s a fork and the new maintainer kept the same README. You can see the last commit was 13 days ago.
And even if it were the original one, it powers draw.io which is very much alive as well as the company behind it. They thought the library is stable enough so they don’t need to maintain it any more.
maxGraph seems to be the graphics lib only, without any templates and any UI. … BUT I’m not sure here. I didn’t have a closer look at the code.
drawio seems to be the full app and it seems to be possible to run it, if you fork the repo and publish it as a github page. .. I definitely would have a closer look at that repo and explore the SVG export / import possibilities.