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Linux Kernel 2.6
[3019 users on Ohloh]
Linux is a free software kernel, which combined with the GNU libraries, core utils and shell form the GNU/Linux operating system.
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.

[530 users on Ohloh]
Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes.
[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.
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.
[77 users on Ohloh]
OpenSolaris is an open source project created by Sun Microsystems to build a developer community around the Solaris Operating System technology.
[74 users on Ohloh]
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system... efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.
[73 users on Ohloh]
Fluxbox is a lightweight and highly configurable window manager with pwm-like tabs.
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.
[32 users on Ohloh]
NetBSD is a free, secure, and highly portable Unix-like Open Source operating system available for many platforms, from 64-bit Opteron machines and desktop systems to handheld and embedded devices. Its clean design and advanced features make it excellent in both production and research environments, and it is user-supported with complete source. Many applications are easily available through pkgsrc, the NetBSD Packages Collection.
Linux Kernel 2.4
[22 users on Ohloh]
Linux is a clone of the operating system Unix, written from scratch by Linus Torvalds with assistance from a loosely-knit team of hackers across the Net. It aims towards POSIX and Single UNIX Specification compliance.
[16 users on Ohloh]
SystemRescueCd is a Linux system available from a bootable CDROM that provides an easy way to perform administrative tasks on your computer, such as creating and editing the partitions of the hard disk or backing up data. It contains a lot of system utilities (such as parted, partimage, and fstools), and basic programs (such as editors, midnight commander, and network tools). It also includes QtParted, a Partition Magic clone that makes editing partitons easy with its Qt graphical user interface...
[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...

DragonFly BSD
[5 users on Ohloh]
DragonFly is an operating system and environment originally based on FreeBSD. DragonFly is developing a radically different approach to concurrency, SMP, and most other kernel subsystems.

DragonFly belongs to the same class of operating system as BSD and Linux and is based on the same UNIX ideals and APIs.

uClinux-dist (ADI Blackfin distribution)
[5 users on Ohloh]
µClinux is a Linux distribution like any other Linux distribution, focused on embedded projects, built from the Linux kernel from kernel.org and assorted other packages, and software from the GNU project. Since µClinux is optimized for size, it uses more compact alternatives (busybox, µclibc, etc) than a non-embedded distribution.

Pronounced "you-see-linux", the name µClinux comes from combining the greek letter "mu" and the english capital "C". "µ" stands for "micro", and the "C" is for "...

[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