Debian

Debian is a free open source operating system for which you need not to pay any license fee. You can install it from internet and then install it on your system hard drive in a simple way with the help of installation wizard. This OS is compatible with a lot of free software. It comes with a lot of features. The main purpose of its development was to help the computer users with a free operating system that they can download from internet or can get it from any other aource for free and can benefit from its qualities.