The XFree86 Project was founded to freely maintain X servers and critical clients for "IA-32" systems. Their work has since expanded to support other non-Intel architectures, but the purpose continues.
"The XFree86 Project, Inc is a non-profit corporation of the state of Texas, USA. The primary charter is to design, implement, and distribute, as free software, an implementation of the X Window System. The software implements the X Window System specifications for many Unix and Unix-like operating systems. All products of The XFree86 Project, Inc, are freely available, and freely redistributable. "
SUSE Software has sponsored development of X server support for various recent graphics cards, including:
AT3D
3D-GLINT
NVidia NV1 and RIVA 128
Matrox Millennium, Mystique, Millennium II, including G100 and G200 models
Trident 9685, Cyber, and TGUI chipsets
Tseng ET6100, ET6300, W32 and W32i
Elsa GLoria-L, GLoria-L/MX, GLoria-S, Permedia, Permedia2
In most cases, the code should ultimately get added into upcoming XFree86 releases...
A commercial X server for MS-DOS that is based on XFree86
Tuning tips on how to make X run faster without changing hardware.
Direct Rendering (DRI) Project at SourceForge
The direct rendering infrastructure, also known as the DRI, is a framework for allowing direct access to graphics hardware in a safe and efficient manner. It includes changes to the X server, to several client libraries, and to the kernel. The first major use for the DRI is to create fast OpenGL implementations.
FTP Directory: ftp://people.redhat.com/mharris/radeon-igp/
Experimental driver for ATI Radeon IGP chipset used on many 2003 laptops.
The X Damage Extension allows applications to track modified regions of drawables.
The X server project holds sources to build an X server separately from a full X distribution. The only drivers supplied are based on the kdrive framework.