Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.

Q4OS is described as 'Fast and powerful operating system based on the latest technologies while offering highly productive desktop environment. We focus on security, reliability, long-term stability and conservative integration of verified new features' and is a Linux Distro in the os & utilities category. There are more than 100 alternatives to Q4OS for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best Q4OS alternative is Linux Mint, which is both free and Open Source. Other great apps like Q4OS are Ubuntu, Debian, Fedora and Arch Linux.
Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.

GNU-Darwin aims to be the most free software distribution. Our mission is two-fold: Focus on projects that leverage our unique combination of Darwin and GNU, and help users to enjoy the benefits of software freedom.



BeeFree OS is inspired from Ubuntu, Windows 7 and Linux Mint. The name is acronym for Beautiful, Effective, Efficient and Freedom.




Ubuntu Cloud is an open source Linux operating system designed to be used as a personal cloud server. It is based on the well known Ubuntu Linux distribution and recognized as an official Ubuntu flavor, distributed by Canonical.


miniBSD is a project to develop a set of scripts that shrinks a running FreeBSD system to a small sized miniBSD distribution suited for small media like USB pens and CF cards.


Springdale Linux (SDL) / Formerly known as PUIAS Linux is a RHEL-based Distribution and Mirror. A project of members of the computing staff of ?Princeton University and the ?Institute for Advanced...
The ubermix is an all-free, specially built, Linux-based operating system designed from the ground up with the needs of education in mind.



A new OS/2-based operating system from Arca Noae, codenamed Blue Lion, arrived today, May 15, 2017, after nearly two years in development.





Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997.



