Atari ST GEM variants look pretty great on higher res video cards and newer hardware.

These days we've got a full open source stack of the whole ST OS, from the BIOS up to GEM. Including variants that offer Unix-like multitasking with protected memory, etc.

https://os-projects.eu/sites/default/files/2018-05/freemint....

http://myaes.lutece.net/images/beta7.jpg

Great pictures do you have a resource for more like these?