Essence
This is one I'm continuasly disappointed to not have been able yet to get running on real hardware. I like what I've seen. But I can't get it to boot, as do others. I don't know too much about the internals of Essence. But it seems to be relatively far in develpment. There is a sleek GUI with tabbing windows in the look of early Chromoium browsers, which looks very inviting, if only I could get it to even try to boot on any computer. The focus has not been on making the OS actually boot on real hardware so far. And unfortunately there has been no release since 2022 and no update to the code for over a year. So I stopped hoping that it might be working soon. I was looking forward to getting to know a knew OS that doesn't take a Unix-like approach and has nice tabbing windows.
(tba:screenshots)
Other new OSs not for real hardware
While Essence is what I created this entry for because I really hoped to be able to try this GUI on real hardware, I'll use the spacce left by the lack of an experience report to mention a few other PSs that look promising but aren't (yet) made to run on actual hardware.
Munal OS
An experimental operating system fully written in Rust, with a unikernel design, cooperative scheduling and a security model based on WASM sandboxing.
TacOS
My from-scratch OS with its own kernel written in C and assembly
TacOS is a UNIX-like kernel which is able to run DOOM, among various other smaller userspace programs. It has things like a VFS, scheduler, TempFS, devices, context switching, virtual memory management, physical page frame allocation, and a port of Doom. It runs both on real hardware (tested on my laptop) and in the Qemu emulator.