NetBSD is a free, fast, secure, and highly portable Unix-like Open Source operating system. It is available for a wide range of platforms, from large-scale servers and powerful desktop systems to handheld and embedded devices.

MINIX 3 is described as 'MINIX is a POSIX-compliant Unix-like operating system based on a tiny microkernel running in kernel mode with the rest of the operating system running as a number of isolated, protected, processes in user mode' and is a operating system in the education & reference category. There are more than 100 alternatives to MINIX 3 for a variety of platforms, including Linux, BSD, Self-Hosted, Mac and Windows apps. The best MINIX 3 alternative is Linux Mint, which is both free and Open Source. Other great apps like MINIX 3 are Ubuntu, Debian, Fedora and Arch Linux.
NetBSD is a free, fast, secure, and highly portable Unix-like Open Source operating system. It is available for a wide range of platforms, from large-scale servers and powerful desktop systems to handheld and embedded devices.

PCLinuxOS is a free easy to use Linux-based Operating System for desktops or laptops.




Knoppix is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive.
Nanos is a new kernel designed to run one and only one application in a virtualized environment. It has several constraints on it compared to a general purpose operating system such as Windows or Linux - namely it's a single process system with no support for running...

Linux From Scratch (LFS) is a project that provides you with the steps necessary to build your own custom Linux system. There are a lot of reasons why somebody would want to install an LFS system. The question most people raise is "why go through all the hassle of manually...
illumos is a free and open-source Unix operating system. It derives from OpenSolaris, which in turn derives from SVR4 UNIX and Berkeley Software Distribution (BSD). illumos comprises a kernel, device drivers, system libraries, and utility software for system administration.
A Fast, friendly, open-source operating system, for newbies, geeks & DIY enthusiasts.




ArchBang is a simple GNU/Linux rolling release distribution which provides you with a lightweight Arch Linux system combined with the Openbox Window Manager.

CrunchBang++ is an open source and completely free [of cost (#!++ does include several of Debian’s non-free packages as well as the non-free repository)] computer operating system, designed as a continuation of the .




A project providing a fully free (as in freedom) derivative of Arch Linux. Inheriting Arch's lightweight and flexibility, Parabola offers software freedom plus all power to the users.



MiniOS is a lightweight and fast Linux distribution designed for installation on a USB drive. The MiniOS project was launched in 2009 as a Linux distribution for USB drives based on Mandriva Linux. However, in 2013 it was suspended due to the liquidation of Mandriva.



