Paranoid Android
crDroid
official crDroid ROM website
AospExtended ROM
Evolution X
GrapheneOS
GrapheneOS is a security and privacy focused mobile OS with Android app compatibility.
Oonly officialy supported for Google Pixel mobile phones.
Windows XP - Internet Archive
Original version of Windows XP Professional with Service Pack 3.ISO is in English!Serial: MRX3F-47B9T-2487J-KWKMF-RPWBY
Windows Download - Microsoft
Parrot Security
Professional tools for Pentesters and Hackers
IBM Power AIX
IBM AIX is IBM’s proprietary Unix operating system designed to run on IBM Power servers.
OpenBSD
the main OpenBSD page
NetBSD
Debian - The Universal Operating System
Debian is an operating system and a distribution of Free Software. It is maintained and updated through the work of many users who volunteer their time and effort.
Arch Linux
Gentoo Linux
The website of Gentoo, a flexible Linux distribution.
Pop! OS - System76
Imagine an OS for the software developer, maker and computer science professional who uses their computer as a tool to discover and create. Welcome to Pop!_OS.
Endless OS
The operating system that comes with everything your family needs. Download Endless OS to access a world of knowledge.
SteamOS - Valve
SteamOS is a public release of our Linux-based operating system. The base system draws from Debian 8, code named Debian Jessie. Our work builds on top of the solid Debian core and optimizes it for a living room experience. Most of all, it is an open Linux platform that leaves you in full control. You can take charge of your system and install new software or content as you want.
CentOS
RISC OS
AROS
TempleOS
AmigaOS
Minix3
Oracle Solaris 11
MorphOS
Friend OS
Friend gives you control of your own data, on your own online computer on locally managed servers.
Haiku OS
Haiku is an open-source operating system that specifically targets personal computing. Inspired by BeOS, Haiku is fast and easy to learn but very powerful.
ReactOS
ReactOS is a free, opensource reimplementation of windows
List of custom Android distributions - Wikipedia