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Inferno is a compact operating system designed for building distributed and networked systems on a wide variety of devices and platforms. With many advanced and unique features, Inferno puts an unrivalled set of tools into your hands.
Inferno can run as a user application on top of an existing operating system or as a stand alone operating system.

Inferno 4th Edition is available under a `dual licence' scheme.

AROS is a portable and free desktop operating system aiming at being compatible with AmigaOS 3.1, while improving on it in many areas. The source code is available under an open source license, which allows anyone to freely improve upon it.

The OpenSolaris project is an open source project sponsored by Sun Microsystems, Inc, that is initially based on a subset of the source code for the Solaris Operating System. It is a nexus for a community development effort where developers from Sun and elsewhere can collaborate on developing and improving operating system technology. The OpenSolaris source code will find a variety of uses, including being the basis for future versions of the Solaris OS product, other operating system projects, and third-party products and distributions.

Initially, the OpenSolaris project will provide the core kernel, libraries and commands that are currently distributed with the Solaris OS. Over time, it is expected that additional parts of the Solaris OS will be made available through the project.

The main difference between the OpenSolaris project and the Solaris Operating System is that the OpenSolaris project does not provide an end-user product or complete distribution. Instead it is an open source code base, build tools necessary for developing with the code, and an infrastructure for communicating and sharing related information. Support for the code will be provided by the community; Sun offers no formal support for the OpenSolaris product in either source or binary form.

The Solaris OS is Sun's operating system distribution and is branded, tested, maintained and supported as a Sun product. Future releases of the Solaris OS will be built from the OpenSolaris source code, but will still be supported in the same manner as current versions of the Solaris OS. At any given time, there may be some software in either the OpenSolaris project or the Solaris OS product that is not present in the other. However, over time the intent is to release as much of the existing source code as possible through the OpenSolaris project and for future development of the source to take place in the OpenSolaris community.

The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our 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.

FreeBSD is an advanced operating system for x86 compatible (including Pentium® and Athlon™), amd64 compatible (including Opteron™, Athlon 64, and EM64T), Alpha/AXP, IA-64, PC-98 and UltraSPARC® 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.

Apple's open source projects allow developers to customize and enhance key Apple software. Through the open source model, Apple engineers and the open source community collaborate to create better, faster and more reliable products for our users.

Beneath the appealing, easy-to-use interface of Mac OS X is a rock-solid foundation that is engineered for stability, reliability, and performance. This foundation is a core operating system commonly known as Darwin. Darwin integrates a number of technologies, most importantly Mach 3.0, operating-system services based on 4.4BSD (Berkeley Software Distribution), high-performance networking facilities, and support for multiple integrated file systems.

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 The NetBSD Packages Collection.

Linux is a clone of the Unix kernel, 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. It has all the features you would expect in a modern fully-fledged Unix kernel, including true multitasking, virtual memory, shared libraries, demand loading, shared copy-on-write executables, proper memory management, and TCP/IP networking.