Before defining it to do two major distinctions:
-Kernel: The core of the operating system.
-Shel: programs that provide a user interface for accessing operating system services. These can sergráficos or simple text depending on the type of interface used. The shells are designed to facilitate the way they are invoked or run the various programs available on the computer.
With this explained, Linux is just a kernel, a core free Unix-based operating system, is one of the leading examples of free software and is licensed under the GPL (General Public License license created by the FSF (Free Software Foundation) .) So I never found a O.S. simply called Linux, if you have a lot of distributions. This means Windows has several "Verciones" because they modify their kernel part or in whole and / or Shel. By contrast, the distributions always have the same kernel, but different Shel.
Linux is a topic that always generates and generate debate and it has a lot to talk.But I will determe here and name some of the distributions, ie ALTERNATIVE OPERATING SYSTEMS VERY COMPLETE.
UBUNTU
Ubuntu is an operating system maintained by Canonical and the community of developers. It uses a Linux kernel, and its origin is based on Debian. Ubuntu is aimed at the novice user and average, with a strong focus on usability and improve user experience. It is composed of multiple software distributed under a license usually cialibre or open source. Web statistics suggest that the market share in Ubuntu "distros" is approximately 49%, 5 6 and with a tendency to rise as web.7 server and a significant increase of 20 million active users by the end of 2011.8

Your sponsor Canonical, is a British company owned by South African entrepreneur Mark Shuttleworth provides the system free of charge and is financed through operating system-related services and selling support.Furthermore, by keeping it free of charge, the company is able to leverage the developers of the community to improve the components of your operating system.
Canonical also supports and provides support for the derivations of Ubuntu: Kubuntu, Xubuntu, Edubuntu, and Lubuntu oriented version of Ubuntu server (Ubuntu Server).
Their slogan is "Linux for human beings" and its name comes from the Ubuntu South African ideology (equality / Loyalty to others.).
Every six months a new release of Ubuntu which is supported by Canonical, for eighteen months, by security updates, patches to critical bugs and minor updates to programs. Versions LTS (Long Term Support), which are released every two years, 13 are supported for five years in lossistemas desktop and server.
Edubuntu
Edubuntu is an official branch of the Ubuntu Linux distribution, designed for use in school settings.
His list of packages is more geared to that end, incorporating the terminal server, and educational applications as GCompris and laKDE Edutainment Suite.
Edubuntu has been developed in collaboration with teachers and technologists from multiple countries. Edubuntu is built on Ubuntu and features a LTSP client architecture, as well as specific educational purposes, with a target population to between 6 and 18. Until version 8.10, had to order the CD ShipIt service for free.
Devian


Debian GNU / Linux is a free operating system, developed by more than a thousand volunteers around the world who collaborate via the Internet.
Debian's dedication to Free Software, its volunteer base, its commercial nature and its open development model distinguishes it from other distributions of GNU operating system. All these aspects and more are included in the so-called Debian Social Contract.
Born in 1993, with the help of the Debian project, with the idea of creating a GNU using Linux kernel and the Debian Project, the organization responsible for its maintenance at present, also developed based GNU systems in other areas.
One of its main objectives is to separate in their versions of the free software non-free software. The development model is independent businesses, created by the users themselves, without relying in any way to business needs. Debian does not sell their software, available to anyone on the Internet, although it allows individuals or companies distribute this software commercially while respecting their license.
Debian GNU / Linux can be installed using different installation mechanisms, such as DVD, CD, Blu-Ray, USB ydiskettes, and even directly from the network.
The Debian Project was founded in 1993 by Ian Murdock,
Linux Mint

Linux Mint is a distribution of GNU / Linux distribution based on Ubuntu (which
in turn is based on Debian). As
of September 7, 2010 edition is also available based on Debian.Linux Mint maintains a current inventory, a stable operating system for the average user, with a strong emphasis on usability and ease of installation. It is known for being easy to use, especially for users without previous Linux experience.
Linux Mint is composed of many software packages, of which most are distributed under a free software license. The primary license used is the GNU General Public License (GNU GPL), which together with the GNU General Public License (GNU LGPL), explicitly states that users are free to run, copy, distribute, study, change, develop and improve software. Linux Mint is funded by its user community. Individual users and companies that use the operating system can act as donors, sponsors and distribution partners. Financial support from the community and advertising on the website helps to maintain free and open Linux Mint.

Mandriva

Mandrake or Mandriva Linux is a Linux distribution published by the French company Mandriva designed for both beginners and experienced users, offering an operating system aimed at personal computers and for servers with a focus on users being introduced to the world of Linux and free software as well as having a wide range and developer community, is suitable for all kinds of variety of needs: workstations, clustering, servers, firewalls, etc.. It is one of the related Linux distributions worldwide.
Mandriva emerged in 2005 as a result of the merger of the French distribution Mandrake Linux and Conectiva Linux Brazilian. Dispatched by the GNU General Public License, and its distribution can be downloaded in ISO format, their assistants or their repositories.
The first edition was based on Red Hat Linux v5.1 and chose the KDE GUI v1.0.Since then he has gone his own way, separate from Red Hat and has included numerous proprietary tools or modified, primarily to facilitate the configuration of the system. Mandrake (its former name) is also known to compile their packages with optimizations
Pentium processor and above, incompatible with older versions such as 386 and 486, stable version of Mandriva Linux is Hydrogen, and was published on August 28, 2011.
As for the logo, which has barely changed since the beginning, the design is patented. This is a five-pointed star in the right arm is at the tip, a spark of five arms. The star is on a blue curve. The star expresses the facilities offered by Mandriva Linux to configure and perform tasks on a computer as easily as if by magic.










