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Fedora is a free operating system that offers the best combination of stable and cutting-edge software that exists in the free software world. Latest version is Fedora 9!
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
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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. [Less]
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.
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.
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.
OpenSolaris is an open source project created by Sun Microsystems to build a developer community around the Solaris Operating System technology.
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.
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
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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. [Less]
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.
Source Mage is a source-based GNU/Linux distribution based on a Sorcery metaphor of "casting" and "dispelling" programs, which we refer to as "spells", and a package manager called "Sorcery". Our packages are designed to allow the user to customize
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the package any way they want (custom flags, etc.) as well as offering as many of the package options as possible to the user up-front (you will not need to know what options a package has or what optional dependencies it can use ahead of time). All of our scripts are GPL'd and our package manager and packages are written in bash, so they are easy to learn and modify. Sorcery supports custom packages maintained by users, which can override the default package and will never be touched by updates. The magic is truly in your hands with SourceMage. [Less]
The goal of the Syllable project is to create a family of easy-to-use free software operating systems. It is the continuation of the BeOS-like AtheOS.
Syllable Desktop has its own C kernel with symmetric multiprocessing, multithreaded pre-emptive
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multitasking, high POSIX compliancy, 64-bit journaled filesystem (AFS) with metadata, an integrated native GUI architecture with an object-oriented C++ API, SDL, singular native toolkit and multi-user desktop environment. The system seeks to be an integrated, lightweight, easy-to-program, powerful, high-performance graphical desktop environment which avoids legacy OS paradigms that frustrate developers and have hindered the computing masses' adoption of a free-software desktop.
Syllable Server is a matching small and efficient Linux server. [Less]
The HelenOS project is an effort to develop a complete and usable modern operating system, yet offering room for experimenting and research. HelenOS uses its own microkernel written from scratch and supports SMP, multitasking and multithreading on
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both 32-bit and 64-bit, little-endian and big-endian processor architectures, among which are AMD64/EM64T (x86-64), ARM, IA-32, IA-64 (Itanium), 32-bit MIPS, 32-bit PowerPC, SPARC V9 and Xen 3.0. Thanks to the relatively high number of supported architectures and suitable design, HelenOS is extremely-well portable. [Less]
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.
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
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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 experience, allowing you to get the most out of your computing time. With PC-BSD you can spend less time working to fix viruses or spyware and instead have the computer work for you. [Less]
MirOS BSD is a secure operating system from the BSD family for 32-bit i386 and sparc systems. It is based on 4.4BSD-Lite (mostly OpenBSD, some NetBSDĀ®). The MirPorts Framework is a portable ports tree to facilitate the installation of additional
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software. The project also releases some portable software: mksh, a pdksh-based shell; PaxMirabilis, an archiver for various formats; MirMake, a framework for building software; MirNroff, an AT&T nroff based man page (and text document) formatter; MirCksum, a flexible checksumming and hash generation tool; and some more. [Less]
Yasux ("Yet another simple UNIX") is yet another simple UNIX written from scratch. Its aim is to be a Single UNIX Specification compliant operating system being simple, small in its size and having a source which is easy to understand. This is not
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achieved by keeping features away, but by letting features be deactivateable, so the user can remove all features which he does not want. [Less]
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.
CleanOS is an operating system developed for educational purposes, initially to be an userspace GNU/Linux application running its executables and simulating the operating system task scheduler and IPC mechanisms, perhaps later a true kernel.
An i386 version of code-dump, the Objective-C decompiler.
Hybrid is a kernel being developed with an emphasis on design and portability. It is largely implemented in C/C++, with a small amount of assembly. The kernel is built on top of elklib.
Symmetry is a small operating system written in C++. It aims to be platform independent and very fast.
It currently has support just for the basic functions needed to run a computer - the GDT, IDT, and paging, as well as dynamic memory management and a simple virtual file system (VFS).
The dyncall library project provides a clean and portable C interface to dynamically issue foreign function calls using small call kernels written in assembly. Instead of providing code for every bridged function call, which unnecessarily results in code bloat, only a modest number of instructions are used to invoke all calls.
SLIND is Small LINux Distribution - a distribution for embedded systems, supporting varios platforms.