Debian

Debian (/ˈdɛbiən/) is a computer operating system composed of software packages released as free and open source software under primarily the GNU General Public License along with other free software licenses. With its inclusion of the GNU OS tools and Linux kernel, Debian GNU/Linux is a popular and influential Linux distribution. It is distributed with access to repositories containing thousands of software packages ready for installation and use. Debian is known for relatively strict adherence to the Unix and free software philosophies as well as using collaborative software development and testing processes. Debian can be used as a desktop as well as server operating system. It focuses on stability and security and is used as a base for many other distributions.