Operating Systems

Linux

• Android-X86, Arch, Debian, EndlessOS, Fedora, FydeOS, Gentoo, KDE,  Mageia, Mklinux, OpenMandriva, Open-SUSE, Slackware, Solus, Ubuntu, Tails, VanillaOS, WattOS

Linux Beautiful Distributions

• Asahi, Cutefish, Deepin, Desert, Elementary, Garuda,  Gershwin, Kylin, Manjaro, Mint, Nitrux, PopOS, Plasma, Zorin

Linux for Education

• AcademicX, Edubuntu, Epoptes, Opensis, openSUSE, Ubermix

Linux: Enterprise Servers

• CentOS, Lineox, Red Hat, ScientificLinux, SUSE, Ubuntu

Linux for Mac

• Budgie, Cutefish, Elementary, PearOS, PopOS, ZorinOS,

Linux for Old Hardware

•  Alpine, Antix, Arch, Bodhi, Budgie, BunsenLabs, Chrome, Damn Small Linux, DebianDog, Elementary, Endeavour, Legacy, Linux Lite, Lubuntu, LXQt, LXLE, Mini, Omega, Peppermint, PepMini, Porteus, PuppyLinux, Q4, Slitaz, Sparkylinux, Tyni Core, Xubuntu, Zorin Lite

Linux Other (User Friendly Gentoo) Distributions

• Calculate, Clip OS, Funtoo, Gentoo STudio, LiGurOS, Pentoo, Redcore

Linux Small Simple & Secure (Without GUI)

•  Alpine, Antix, PuppyLinux, Slitaz, Tyni Core

Unix

• AiryxOS, FreeBSD, GhostBSD, HelloSystem, Illuos, MidnightBSD, NetBSD, OpenBSD, OpenIndiana

OTher OSes

• Dahlia, DOSBox, FreeDos, Fuchsia, GNU Hurd, Haiku, Kolibri, Menuet, Minix3, Raspberry Pi,  ReactOS, Temple, Ubuntu Touch

Oldies

• Macpaint, ATARI, AMIGA, Amikit, Aftershock, AtheOS, CDE; Commodore, NsCDE, Vice, Z64k, Haiku (BeOS)
• Gopher Server, KolibirOS, LUnix: Commodore64, MacOS9, MenuetOS, MorphOS (PPC), MS-DOS, OpenVMS, Atari 2600, Windows95

OSUtils

• Boot System, Fink, Hackintosh, Homebrew, MacOS_OpenCore Patcher, MacPorts, OpenCore Patcher, Rescuezilla

Open Source Licenses

• Free and Non Free Software, Copy-left, Noncopy-Left, & X11, Open Source Licenses, The Free Software Foundation

Other Linux-Unix Issues

• Distrowatch, MacOSForge, UnixGuide, GNU Hurd, Internet History, Unix History, Commands, Cheat-Sheet