http://www.ubuntu.com/

Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.

http://www.freespire.org/

Freespire is a community-involved, Linux-based operating system that combines the best that free, open source software has to offer (community involved, freely distributed, open source code, etc.), but also provides users the choice of including proprietary codecs, drivers and applications as they see fit. With Freespire, the choice is yours as to what software is installed on your computer, with no limitations or restrictions placed on that choice. How you choose to maximize the performance of your computer is entirely up to you.

http://www.damnsmalllinux.org//

D@mn Small Linux, is a 50Mb linux distribution.

http://www.reactos.org/en/index.html

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.

http://eyeos.org/

The idea of eyeOS is to create a free, open source (AGPLv3) product easy to install on a web server so you will have your own cloud system under your control. You can also participate in a great community of users and developers, able to create your own apps. Welcome to the eyeOS project.

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