Ubuntu

Fast, free and incredibly easy to use, the Ubuntu operating system powers millions of desktop PCs, laptops and servers around the world.

Compatible

Ubuntu works brilliantly with a range of devices. Simply plug in your MP3 player, camera or printer and you’ll be up and running straightaway. No installation CDs. No fuss. And Ubuntu is compatible with Windows files too, so you can open, edit and share Microsoft Office documents stress-free.

Fast

Ubuntu loads quickly on any computer, but it’s super-fast on newer machines. With no unnecessary programs or trial software to slow things down, you can boot up and open a browser
in seconds

if you want to download Ubuntu,visit this site:
- http://www.ubuntu.com/download/desktop

Kubuntu
Kubuntu is an operating system built by a worldwide team of expert developers. It contains all the applications you need: a web browser, an office suite, media apps, an instant messaging client and many more. Kubuntu also family of Ubuntu,it is =Ubuntu+KDE-->Kubuntu
Kubuntu is an open-source alternative to Windows and Office.

Surf the Internet with Firefox

Users more familiar with the award-winning Firefox web browser can install it using our one-click installation process. With Firefox you can browse faster and safer.
More open-source browsers are available through Kubuntu's software repositories.

Email made easy

Kubuntu uses KMail to let you access your email. Whether it's an important business email or a letter to a friend, KMail's got you covered. KMail integrates seamlessly with your address book and Kontact, one of the productivity suites available in Kubuntu.

The GUI

If you want to download Kubuntu,visit this site:
-http://www.kubuntu.org/getkubuntu

Xubuntu
Xubuntu is an officially recognised flavor of the Ubuntu Linux operating system. Xubuntu comes with Xfce, which is a stable, light and configurable desktop environment.
Xubuntu is perfect for those who want the most out of their desktops, laptops and netbooks with a modern look and enough features for efficient, daily usage. It works well on older hardware too.
It is also version of Ubuntu which is = Ubuntu+Xfce>> Xubuntu

Customizable

It’s easy to customize Xubuntu to match your personal tastes. It takes but a few clicks to change the theme, amount and location of panels, font, and more. Install panel plugins and more applications for additional functionality using the Software Center. Finding new software is a breeze and installation is just a click away. Once applications are installed, updates can be downloaded and installed automatically.

The GUI

 If you want to download Xubuntu,visit this site:
- http://xubuntu.org/getxubuntu/