Originally developed by Linus Torvalds in 1991, the UNIX®-like Linux operating system now benefits from the contributions of millions of users and developers around the world. The linux operating system is getting popular day by day as more and more companies and individuals migrate to linux. In this post I will list down 30 most popular free linux distros.

1) Ubuntu Linux
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.

2) openSUSE
The openSUSE project is a community program sponsored by Novell.Promoting the use of Linux everywhere, this program provides free, easy access to openSUSE, a complete Linux distribution. The openSUSE project
has three main goals: make openSUSE the easiest Linux for anyone to obtain and the most widely used Linux distribution; leverage open source collaboration to make openSUSE the world's most usable Linux
distribution and desktop environment for new and experienced Linux users; dramatically simplify and open the development and packaging processes to make openSUSE the platform of choice for Linux developers
and software vendors.

3) Fedora
Fedora is a Linux-based operating system that provides users with access to the latest free and open source software, in a stable, secure and easy to manage form. We strongly believe in the bedrock principles that created all the components of our operating system, and because of this we guarantee that Fedora will always be free for anybody, anywhere, to use, modify and distribute.

4) Linux Mint
Linux Mint is an Ubuntu-based distribution whose goal is to provide a more complete out-of-the-box experience by including browser plugins, media codecs, support for DVD playback, Java and other components. It also adds a custom desktop and menus, several unique configuration
tools, and a web-based package installation interface. Linux Mint is compatible with Ubuntu software repositories.

5) PCLinuxOS
PCLinuxOS is distributed as a LiveCD, and can also be installed to a local hard drive. LiveCD mode lets you try it without making any changes to your computer. If you like it, you can install it to your hard drive. Locally installed versions of PCLinuxOS utilize the Advanced Packaging Tool (or APT), a package management system (originally from the Debian distribution), together with Synaptic, a GUI frontend to APT.
PCLinuxOS has a script called mklivecd, which allows the user to take a 'snapshot' of their current hard drive installation (all settings, applications, documents, etc.) and compress it into an ISO CD/DVD image. This allows easy backup of a user's data and also makes it easy to create your own custom live CD/DVD.

6) Mandravia
Mandriva Linux (formerly Mandrakelinux) was created in 1998 with the goal of making Linux easier to use for everyone. At that time, Linux was already well-known as a powerful and stable operating system that
demanded strong technical knowledge and extensive use of the "command line"; MandrakeSoft saw this as an opportunity to integrate the best graphical desktop environments and contribute its own graphical
configuration utilities and quickly became famous for setting the standard in ease-of-use and functionality. With this innovative approach, Mandriva Linux offers all the power and stability of Linux to
both individuals and professional users in an easy-to-use and pleasant environment. Thousands of new users are discovering Linux each and every day and finding it a complete replacement for their previous
operating system. Linux as a server or workstation has no reason to be jealous of any other more established operating systems.

7) Debian GNU/Linux
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.

8) Dreamlinux
If you're searching for an operating system that allows you to: be free, communicate with the whole world, read, write, produce art, music, drawings, images, etc., as well as use the same kind of stuff produced by a worldwide community and, better yet, fastly, simply and safely share them all, you now have no excuses not to give Dreamlinux 3.0 Desktop Edition.
Dreamlinux Desktop Edition 3.0 is a complete redesign of the distro, now supporting a totally independent architecture named Flexiboost *, based on overlaid modules.Packaging the best office, image, design and multimedia OpenSource Software ( OSS ), Dreamlinux 3.0 Desktop Edition Edition
allows you to produce professional-quality contents

9) Sabayon Linux
Sabayon Linux is a live DVD designed to transform a computer into a powerful Gentoo Linux system in less than 5 minutes. Gentoo Linux is a Linux distribution powered by a software install manager engine called "Portage". Besides functioning as a live DVD, Sabayon Linux can also be installed on a hard disk, acting effectively as an easy-to-use Gentoo installation disk. The live DVD includes a large range of desktop environments and open source software applications, such as KDE, GNOME, XFce, Fluxbox, KOffice, OpenOffice.org, FreeNX, amaroK, Kaffeine, etc.

10) Damn Small Linux
Damn Small Linux is a business card size (50MB) live CD Linux distribution. Despite its minuscule size it strives to have a functional and easy to use desktop. Damn Small Linux has a nearly complete desktop, including XMMS (MP3, and MPEG), FTP client, links-hacked web browser, spreadsheet, email, spellcheck (US English), a word-processor, three editors (Nedit, nVi, Zile [emacs clone]), Xpdf, Worker (file manager), Naim (AIM, ICQ, IRC), VNCviwer, SSH/SCP server and client, DHCP client, PPP, PPPoE, a web server, calculator, Fluxbox window manager, system monitoring apps, USB support, and soon it will
have PCMCIA support as well. If you like Damn Small Linux you can install it on your hard drive. Because all the applications are small and light it makes a very good choice for older hardware.

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

12) CentOS
CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor. CentOS conforms fully with the upstream vendors
redistribution policy and aims to be 100% binary compatible. CentOS is developed by a small but growing team of core developers. In turn the core developers are supported by an active user community
including system administrators, network administrators, enterprise users, managers, core Linux contributors and Linux enthusiasts from around the world.

13) Slackware Linux
Slackware Linux is an
advanced Linux operating system, designed with the twin goals of ease of use and stability as top priorities. Including the latest popular software while retaining a sense of tradition, providing simplicity and ease of use alongside flexibility and power, Slackware brings the best of all worlds to the table.

14) Kubuntu Linux
Kubuntu is one the variants available from the Ubuntu project. Our Kubuntu CDs are made up of Ubuntu's base plus KDE. You can get exactly the same effect by installing Ubuntu Desktop and adding the KDE
packages (and removing the Gnome packages) from the Ubuntu archives.

15) MEPIS Linux
SimplyMEPIS as a Live CD or DVD allows you to run the Linux operating system and all the programs from your CD or DVD drive before you install. There is no need to backup all your data, delete the whole
hard disk and install the system, just to find it doesn't meet your needs and expectations. It is pre-configured for simplicity and ease of use, and you will be productive in a matter of minutes, even if this is your first try with Linux. It features unique hardware detection and configuration superior to any other Linux versions.

16) Puppy Linux
Puppy really is small, the live-CD typically being 85MB, yet therereally is a complete set of GUI applications. Being so small, Puppy usually loads completely into RAM, which accounts for the incredible
speed.


17) Gentoo Linux
Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community are all hallmarks of the Gentoo experience. Thanks to a technology called Portage, Gentoo can become an ideal secure server, development workstation, professional desktop, gaming system, embedded solution or something else -- whatever you need it to be. Because of its near-unlimited adaptability, we call Gentoo a meta distribution.

18) Arch Linux
Arch Linux is an independently developed, i686-optimised Linux distribution targeted at competent Linux users. It uses 'pacman', its home-grown package manager, to provide updates to the latest software
applications with full dependency tracking. Operating on a rolling release system, Arch can be installed from a CD image or via an FTP server. The default install provides a solid base that enables users to
create a custom installation. In addition, the Arch Build System (ABS) provides a way to easily build new packages, modify the configuration of stock packages, and share these packages with other users via the
Arch Linux User Repository.

19) Zenwalk Linux
Zenwalk Linux (formerly Minislack) is a Slackware-based GNU/Linux operating system with a goal of being slim and fast by using only one application per task and with focus on graphical desktop and multimedia
usage. Zenwalk features the latest Linux technology along with a complete programming environment and libraries to provide an ideal platform for application programmers. Zenwalk's modular approach also
provides a simple way to convert Zenwalk Linux into a finely-tuned modern server (e.g. LAMP, messaging, file sharing).

20) KNOPPIX Linux
Knoppix is a bootable CD 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 Linux demo, 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.