Here is the humongous list:*

*note, sorry if there are any mistakes, this is going to be a list of like 500 OSES, it is hard to keep track of all of them.

OpenSUSE: Tumbleweed, Leap, Leap Micro, and MicroOS
NixOS
Omarchy
Nyarch Linux
FemboyOS
PearOS
Arch Linux
Gentoo
Debian (Linux)
Calculate Linux
Ubuntu
Bluefin Linux
VanillaOS
ArchCraft Linux
Cutefish
Deepin
Pop!_OS
Manjaro
Garuda Linux
Fedora
Kali Linux
Slackware
Fedora Workstation
Adelie Linux
Alpine Linux
Elementary OS
Zorin OS
KDE Neon
Kubuntu
Linux Mint
Xubuntu
Lubuntu
Damn Small Linux
antiX
Bodhi Linux
Puppy Linux
Void Linux
OmniOS
Q4OS
KaOS
Peppermint OS
Endless OS
Debian GNU/Hurd
Artix Linux
Feren OS
OpenMandriva
Knoppix
Linux Lite
EndeavourOS
CachyOS
RebornOS
Archman Linux
ArchBang/GreenBang Linux
ArcoLinux
BlackArch
ArkOS
FreeBSD
NetBSD
OpenBSD
DragonFlyBSD
HardenedBSD
GhostBSD
CheriBSD MidnightBSD
NanoBSD
PicoBSD
DesktopBSD
TrustedBSD
TrueNAS Core
Proxmox VE
XigmaNAS
OPNsense
Windows NT 4.0
Windows Longhorn
Windows 98
Windows ME
Windows 95
Windows 3.1x
Windows 2000
Windows XP
Windows Vista
Windows 7
Windows 8.1
Windows 8
Windows 10
Windows 11