Linux

Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution.

The History of X11

Maybe I like this video so much because I have lived much of the history of X11, at least the second half of it as I was one of those people using KDE 1.0 and GNOME 1.0 back in the late 1990 when I was in High School.