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Debian GNU/Linux
[981 users on Ohloh]
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux.
[680 users on Ohloh]
The K Desktop Environment (KDE) is a graphical desktop, a set of applications and a development platform. It is created by a community of people dedicated to create a free and user-friendly computing experience. KDE offers all necessary means to easily build all kinds of applications upon.

KDE has been around since 1996, with code change history dating back at least to 1997.

KDE is one of the biggest free software C++ project around and one of the two leaders of unix desktops.

Common Unix Printing System (CUPS)
[634 users on Ohloh]
CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network p...
[230 users on Ohloh]
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.
Kubuntu Linux
[194 users on Ohloh]
Kubuntu is a a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.
[151 users on Ohloh]
Xfce is a lightweight desktop environment for various *NIX systems.
Designed for productivity, it loads and executes applications fast, while conserving system resources.
openSUSE Linux
[148 users on Ohloh]
The openSUSE project is a community program sponsored by Novell. Promoting the use of Linux everywhere, openSUSE.org provides free, easy access to the world's most usable Linux distribution, openSUSE. The openSUSE project gives Linux developers and enthusiasts everything they need to get started with Linux.
FreeBSD Ports
[72 users on Ohloh]
The FreeBSD Ports and Packages collection is used to install and manage software on the FreeBSD operating system.
Mandriva Linux
[50 users on Ohloh]
Mandriva Linux is a community-based Linux distribution, suitable for a wide range of solutions: from clustering to servers, firewalls and - most commonly - desktops. Mandriva Linux has a long history of open development, especially via the "Cooker", a fluid distribution that resembles a stable release for a few weeks every six months.
Parsix GNU/Linux
[49 users on Ohloh]
Parsix GNU/Linux is a live and installation CD derived from KANOTIX and based on Debian. It is a complete GNOME centric desktop oriented distribution. Beside of the dozens supported languages, Parsix GNU/Linux also supports Persian keyboard and users can switch to Persian with Alt+Shift keys. You can install and use Parsix GNU/Linux as your PC's operating system.
Pardus Linux
[38 users on Ohloh]
Pardus is GNU/Linux distribution developed by TUBITAK/UEKAE according to computer literates' basic desktop needs; uses existing distributions' dominant parts as concept, architecture or code; provides easy use, configuration, installation with configuration environment and tools that can be converted to an autonomous system.
[14 users on Ohloh]
LXDE is a free desktop environment for Unix and other POSIX compliant platforms, such as Linux or BSD. The name LXDE stands for "Lightweight X11 Desktop Environment".

LXDE is a project aimed to provide a new desktop environment which is lightweight and fast. It's not designed to be powerful and bloated, but to be usable and slim enough, and keep the resource usage low. Different from other desktop environments, we don't tightly integrate every component. Instead, we tried to make all compo...

[6 users on Ohloh]
Eterm is a vt102 terminal emulator intended as a replacement for xterm. It is designed with a Freedom of Choice philosophy, leaving as much power, flexibility, and freedom as possible in the hands of the user. It is designed to look good and work well, but takes a feature-rich approach rather than one of minimalism. Current features include color support, background images (all Imlib-supported formats), theme support, and pseudo-transparency.
[4 users on Ohloh]
AuroraUX is an operating system distribution based on the OpenSolaris kernel source base. The goal of the AuroraUX project is to create a high reliability core operating system using the US Department of Defense-developed Ada programming language. While it is meant to be minimalistic and used as a base for other distributions, it will also be functional as an operating system in itself.

#auroraux @ irc.freenode.net

[4 users on Ohloh]
MidnightBSD is a desktop operating system for ia32 and amd64/emt64 computers. It uses GNUstep and related software to provide an easy to use environment.
[4 users on Ohloh]
PC-BSD is a free operating system with ease of use in mind. Like any modern system, you can listen to your favorite music, watch your movies, work with office documents and install your favorite applications with a setup wizard at a click.

PC-BSD is a complete desktop operating system, which has been designed with the "casual" computer user in mind. It offers the stability and security that only a BSD-based operating system can bring, while as the same time providing a comfortable user exp...

Ark Linux
[1 users on Ohloh]
Ark Linux is a Linux distribution for everyone - designed to be easy to install and learn for users without prior Linux (or computer) experience, while powerful enough for longtime Linux users. Ark Linux is based on KDE desktop environment.
[1 users on Ohloh]
Backbone is a user environment, using the GNUstep libraries, using the design of the NeXTstep/OPENSTEP user environment as a springboard; the idea is to do better, not just different.
[0 users on Ohloh]
EDE (Equinox Desktop Environment) is small and very portable desktop environment designed to be very lightweight in memory and resource usage.