Linux

If there is something worth mentioning in the world of information technology in general, operating systems in particular, it is unequivocally the Linux OS (see Figure 1.21). That is because the world of technology knows no innovative initiative to have gathered more volunteers than Linux itself. Unlike Windows Server, known to be proprietary OS, Linux server is licensed under the GNU GPL (free software license) and distributed by several distros such as Red Hat, SUSE, Oracle, Novell, Ubuntu, Debian, Mandrake, Mandriva, and so on. The Linux community is one of the largest communities in the world of volunteer developers from across the globe that would contribute to further Linux development. In essence, Linux is CLI-based, but there are also versions of graphical user interfaces like KDE and GNOME among the most popular. Linux, like Windows Server, is offered in 64-bit platform too: