It wouldn't be too hard to make a Linux version. The major thing I'd need to figure out is how to require or include the prerequisites of GhostScript and GraphicsMagick. The app will technically work without either, but thumbnails of PDFs won't be generated.
It turns out this is a bit harder than expected, largely due to some degradations in tooling over the years. I'll keep investigating, and update this thread when I have more information.
I've added a Linux apppackage that you should be able to install. I've not tested it myself and make no promises about its functionality. I will, of course, try to fix any issues you encounter.
I highly recommend installing both GhostScript and GraphicsMagick for best compatibility.
