FreeDOS
FreeDOS aims to be a complete, free, 100% MS-DOS compatible operating system (mostly achieved except Windows compatibility – Windows standard-mode works on FreeDOS, but 386-mode / WfW 3.11 does not.)
- Running classic DOS games
- Running business software that only supports DOS
- Supporting embedded DOS systems, such as a computerized cash register or till
Click here to Download FreeDOS
RxDOS
RxDOS is a fast MS-DOS clone that supports very large disk drives, FAT32 volumes, and Windows 95/98 Long Filenames. its source code is also available free at sourceforge.Click here to Download RxDOS
React OS
ReactOS is a free, modern operating system
based on the design of Windows® XP/2003. Written completely from
scratch, it aims to follow the Windows® architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture.
ReactOS
had its origins in an older project known as FreeWin95. FreeWin95
aimed at being binary compatible with Microsoft® Windows® 95. It was
founded by Yannick Majoros around 1996. But the development never took
off substantially due to endless talks on design and thoughts of
following the NT architecture.The main goal of the ReactOS project is to provide an operating system which is binary compatible with Windows.
This
will allow your Windows applications and drivers to run as they would
on your Windows system. Additionally, the look and feel of the Windows
operating system is used, such that people accustomed to the familiar
user interface of Windows® would find using ReactOS straightforward. The
ultimate goal of ReactOS is to allow you to remove Windows® and
install ReactOS without the end user noticing the change.Please bear in
mind that ReactOS 0.3.7 is still in alpha stage, meaning it is not feature-complete and is not recommended for everyday use.Click Here to Download ReactOS
OpenSolaris
OpenSolaris is an operating system (OS), an open source project licensed under CDDL, and a community. The project’s goals are innovation, collaboration, and the extension of OpenSolaris technology.OpenSolaris is free, open source,
and well-suited for desktops, laptops, servers, and data centers. The
quality requirement of OpenSolaris is perhaps best stated as Production Ready All The Time.
OpenSolaris technical communities maintain kernel and userland consolidations and launch new technology projects.
OpenSolaris is developed by communities working in the different
projects. Each project focuses on one or more specific areas of the
system. The OpenSolaris developer project is sponsored by Sun
Microsystems, Inc.Click here to download OpenSolaris
Darwin
Darwin is the UNIX technology-based foundation of Mac OS X. Darwin integrates several technologies. Among the most important are
4.4BSD-based operating-system services (built on the Mach 3.0 microkernel), the I/O Kit, networking
facilities, and support for multiple integrated file systems.
Developers can use Darwin to port UNIX/Linux applications and create
kernel extensions.In addition to being part of Mac OS X, Darwin is a standalone, BSD-based operating system. (BSD, short for Berkeley Software Distribution, is a family of UNIX variants descended from Berkeley’s version of UNIX.)Darwin is also occasionally used to refer to the Darwin Streaming Server, also known as the QuickTime Streaming Server (QTSS).
Click Here to download Darwin
FreeBSD
FreeBSD is an advanced operating system for x86 compatible (including Pentium® and Athlon™), amd64 compatible (including Opteron™,
Athlon™64, and EM64T), ARM, IA-64, PowerPC, 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.FreeBSD offers advanced networking, performance, security and compatibility features today which are still missing in other operating systems, even some of the best commercial ones.
FreeBSD makes an ideal Internet or Intranet
server. It provides robust network services under the heaviest loads
and uses memory efficiently to maintain good response times for
thousands of simultaneous user processes.Click here to download FreeBSD
Debian Linux
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. Debian GNU/Linux provides more than a pure OS: it comes with over 18733 packages, precompiled software bundled up in a nice format for easy installation on your machine.
Click here to Download Debian
Fedora Linux
Fedora is a Linux-based operating system that showcases the latest in free and open source software. Fedora is always free for anyone to use, modify, and distribute.
It is built by people across the globe who work together as a
community: the Fedora Project. The Fedora Project is open and anyone is
welcome to join.Click here to Download Fedora
Koppix 
KNOPPIX is a bootable CD or DVD with a collection of GNU/Linux
software, automatic hardware detection, and support for many graphics
cards, sound cards, SCSI and USB devices and other peripherals. KNOPPIX
can be used as a productive Linux desktop, educational CD, rescue
system, or adapted and used as a platform for commercial software
product demos. It is not necessary to install anything on a hard disk.
Due to on-the-fly decompression, the CD can have up to 2 GB of
executable software installed on it. (over 8 GB on the DVD “Maxi”
edition).Click here to download Koppix
Mandriva
Mandriva Linux is a community-based Linux distribution, suitable for a wide range of situations from typical desktop use through development and server roles up to clustering.
Mandriva Linux is based on the Cooker development project sponsored by Mandriva. Hundreds of passionate free software developers work openly on the core of the distribution. This open, community-driven development system has been in place since 1998, making it one of the longest-standing open source development communities around. The involvement of the Mandriva development community helps us to make Mandriva Linux one of the largest, most up-to-date, integrated, internationalized and standardized distributions available.
Click here to Download Mandriva
Slackware
Slackware Linux is a complete 32-bit multitasking “UNIX-like” system. It’s currently based around the 2.6 Linux kernel series and the GNU C Library version 2.7 (libc6). It contains an easy to use installation program, extensive online documentation, and a menu-driven package system.
A full installation gives you the X Window System, C/C++ development environments, Perl, networking utilities, a mail server, a news server, a web server, an ftp server, the GNU Image Manipulation Program, Mozilla Firefox, plus many more programs. Slackware Linux can run on 486 systems all the way up to the latest x86 machines (but uses -mcpu=i686 optimization for best performance on i686-class machines like the P3, P4, Duron/Athlon, and the latest multi-core x86 CPUs).
Click here to Download Slackware
Ubuntu
Ubuntu is a community developed operating system that is perfect for laptops, desktops and servers.
Whether you use it at home, at school or at work Ubuntu contains all
the applications you’ll ever need, from word processing and email
applications, to web server software and programming tools.
Ubuntu is and always will be free of charge.
You do not pay any licensing fees. You can download, use and share
Ubuntu with your friends, family, school or business for absolutely
nothing.Click here to Download UbuntuPS: This is by no means a complete list of Free operating systems… but that is all for today folks… I will be updating this list through out this week. My aim is to make this the best resource for finding a free alternative to Microsoft Windows and other proprietary Operating systems.
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