It’s called NovelOS. I actually expected it to be a stripped down Linux.

Not sure about that as it has two downloads, one for MacOS, the other for Windows, if it was an OS it would be an ISO file.. The documentation does not give a clue about the install, so I guess its all explained when you run the installer, but as there is no Linux option, I guess I will never know.

Something like this could definitely replace my crufty Obsidian + scripts workflow if it ran on Linux.