Linuxis a powerful operating system that can be freely used and redistributed under the terms of the GNU Public License. All those metal boxes and piles of wire in your closet (where your clothes should be), are what used to be the latest, coolest computers. If you put them together, there's still some fun to be had.
Red Hat,
Inc. is a company dedicated to free and open source software, and a major Linux distribution vendor. Red Hat was founded in 1995 and has its corporate headquarters in Raleigh, North Carolina with satellite offices worldwide.[1]

The company is best known for its enterprise operating system Red Hat Enterprise Linux, and more recently through the acquisition of open source enterprise middleware vendor JBoss. Red Hat provides operating system platforms along with middleware, applications, and management solutions, as well as support, training, and consulting services.
Ubuntu
Ubuntu is a community developed, Linux-based operating system that is perfec

t for laptops, desktops and servers. It contains all the applications you need - a web br
owser, presentation, document and spreadsheet software, instant messaging and much more.