X Sites

Kenton Lee's Technical X Window and Motif Web Sites (Rate)	This website is about X and the Motix window manager with many links to other sites.
Guide to X Window Managers (Rate)	This website is an excellent Guide to the various X window managers available.
X Windows Version 11.5, A Concise Description (Rate)	An article describing the X Windows system from a programmers point of view.
KDE.org (Rate)	KDE is one of the most popular graphical environments used with X.
XFree86 Project (Rate)	Their website states "The XFree86 Project, Inc is a non-profit organisation which produces XFree86, a freely redistributable open-source implementation of the X Window System".
X and Motif (Rate)	A web site by Eric Foster Johnson who has written several popular Linux books.
X.org (Rate)	Their website states "X.Org is the worldwide consortium empowered with the stewardship and collaborative development of the X Window System technology and standards".