Applications
Terminal Emulators, Comp.windows.x.apps FAQ, Copylefted Software, DDD - Data Display Debugger, dxpc - the Differential X Protocol Compresser, Electric Sheep, GTKeyboard, Internet-Based MPEG Video Audio Player, ivtools, John's World of XV, Knews
Servers
Cygwin/X, Hummingbird Ltd. Connectivity Products, Labtam, Inc., MI/X, Oreilly Online, StarNet Communications Corp., SuperX, Virtual Network Computing (VNC), WinaXe, WRQ Reflection X
Vendors
BX PRO, Free Stuff from MicroImages, Inc., Integrated Computer Solutions, KL Group Inc., Labtam, Inc., NetSarang Computer, Inc., Xi Graphics, Inc, XLink Technology, Inc., Xmanger
Window Managers
CDE, FVWM, IceWM, Window Maker, aewm, AfterStep Applets, amiwm, B4Step Window Manager, Blackbox, Enlightenment window manager, Evilwm, Fast Light Window Manager, FluxBox, Generic Window Manager Manual
DialoX
A distributed user interface programming system written for X11 and GTK that allows user interfaces to be built rapidly. For use with symbolic programming languages.
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 (ICC
Atoms, selections, cut buffers, window manager communication, session management, sharing resources, colors.
New Rendering Model for X
http://www.usenix.org/publications/library/proceedings/usenix2000/freenix/full_papers/packardrender/
By Keith Packard. Article on current limits and future development of X Windows. [PDF]
The X Window System
A set of Chris Browne's web pages on the technologies of X and related graphical systems.
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 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.
X-Window Architecture
This article want to explain what is the X-Window client/server architecture and to take advantage of it.
X11/Graphics
Holds graphics X11 programs and libraries. These include programs for the manipulation or conversion of graphics (bitmaps in particular).
XDM ThemeStuff
A set of scripts to make Theming the XDM (X Display Manager) easier.
XFree86 Font Deuglification Mini-HOWTO
How to fix ugly, tiny and unreadable fonts in XFree86.
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.