UBUNTU LINUX (My personal favorite)
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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.
OpenSUSE LINUX
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openSUSE is a free and Linux-based operating system for your PC, Laptop or Server. You can surf the web, manage your e-mails and photos, do office work, play videos or music and have a lot of fun!
LINUX Mint
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Excerpt From DistroWatch.com:
Linux Mint is one of the surprise packages of the past year. Originally launched as a variant of Ubuntu with integrated media codecs, it has now developed into one of the most user-friendly distributions on the market - complete with a custom desktop and menus, several unique configuration tools, a web-based package installation interface, and a number of different editions. Perhaps most importantly, this is one project where the developers and users are in constant interaction, resulting in dramatic, user-driven improvements with every new release.Fedora Project
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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.
The Fedora Project is out front for you, leading the advancement of free, open software and content.
DEBIAN LINUX
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Excerpt From DistroWatch.com:
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system is called Debian GNU/Linux, or simply Debian for short. Debian systems currently use the Linux kernel. Linux is a completely free piece of software started by Linus Torvalds and supported by thousands of programmers worldwide. Of course, the thing that people want is application software: programs to help them get what they want to do done, from editing documents to running a business to playing games to writing more software. Debian comes with over 20,000 packages (precompiled software that is bundled up in a nice format for easy installation on your machine) - all of it free. It's a bit like a tower. At the base is the kernel. On top of that are all the basic tools. Next is all the software that you run on the computer. At the top of the tower is Debian -- carefully organizing and fitting everything so it all works together.