XFree86 - X implementation for Intel x86-based platforms.

Broadway Project - Running X Window over WWW.

Freedesktop.org - A free software project to work on interoperability and shared technology for desktop environments for the X Window System.

Inter-Client Communication Conventions Manual (ICCCM) - Atoms, selections, cut buffers, window manager communication, session management, sharing resources, colors.

Keith Packard - Papers and Talks - X Window related papers and talks.

New Rendering Model for X - By Keith Packard. Article on current limits and future development of X Windows. [PDF]

Open Group Desktop Technologies (X.Org) - Official distribution of X11.

SiS/XGI graphics chipsets and X.org/XFree86/Linux - Complete description of driver options, configuration issues and download links.

UTF-8 and Unicode FAQ - All you need to know to use Unicode/UTF-8 on Unix and Linux systems.

What is X / X Server / XFree86 - At The Linux Revolution. Information on X / X Server / XFree86. Gain a little knowledge on the graphical interface for Linux.

X on TV - How to set up XFree86 for a TV.

X Window System and Motif WWW Sites - List of over 600 technically-oriented X Window sites: X Consortium, Motif, X Advisor magazine, major X technologies, CDE, internationalization, FAQs, on-line technical papers, on-line tutorials, X for PCs and Linux, and general human-computer interaction.

XDM ThemeStuff - A set of scripts to make Theming the XDM (X Display Manager) easier.

Xprint - A X11-based print system and API which enables X11 applications to use devices like printers, FAX or create documents in formats like PostScript, PDF, PCL.