GNU/Linux

GNU/Linux, more commonly called Linux, is an Unix-like operating system consisting of GNU core utilities and the base Linux kernel. The Linux kernel was first developed by Linus Torvalds in 1992, initially named Freax (Free + Freak + the x suffix). Some popular distributions that uses Linux are Ubuntu, Fedora, Arch, Gentoo, Debian and many others.

KDE (K Desktop Environment)

GNOME (GNU Network Object Model Environment)

Xfce

CDE (Common Desktop Environment)

MATE

Cinnamon

Window Managers

Others