They're coming in thick and fast now... seems someone out there wants to keep X11 alive, thankfully.
www.theregister.com
The guy seems to like writing code in asm, or at least getting an AI to write asm for him. 
Also mentioned are yserver, phoenix and Xlibre. So that's 4 so far, and counting... 5 if you count Xorg.
Arcan gets a mention in the article too, I remember reading about that years ago.
arcan-fe.com
Frame: A new X11 server – implemented directly in assembly
Joins yserver, Phoenix, and of course XLibre – and outlier Arcan
Also mentioned are yserver, phoenix and Xlibre. So that's 4 so far, and counting... 5 if you count Xorg.
Arcan gets a mention in the article too, I remember reading about that years ago.
Arcan: 10 Years of Online Obscurity
… and 23 years of tedious yak shaving. Ten years ago my rather anemic post on the Arcan project started to circulate. It got enough attention that I considered stopping right there and …