Similar to Xv6
Digital UNIX
Domain/OS
Domain/OSHI-OSF/1-MJ
HI-UX
HP-UX
HP-UXIllumos
IllumosNexenta OS
Nexenta OSOSF/1
OSF/1PANIX
PWB/UNIX
PWB/UNIXQNX
QNXResearch Unix
Research UnixSprite (オペレーティングシステム)
Sprite (operating system)Tru64 UNIX
Tru64 UNIXUbuntu-restricted-extras
Ubuntu-restricted-extrasUNICOS
UNICOSUNIX/32V
UNIX/32V▲1 trendsUP-UX
UX/4800
OpenIndiana
OpenIndianaSailfish OS
Sailfish OSLinux
Linux