Mesa/GLX module for 3D graphics support for RIVA 128, RIVA 128ZX, RIVA TNT, RIVA TNT2. The 3D support is for development on XFree86 3.3.3.1 only, and is not a high performance architecture. The upcomingf XFree86 X server 4.0 will use the Direct Rendering Infrastructure required to take full advantage of the RIVA processors. Check with Precision Insight for more information. Suse also has done work toward a high performance interface.
The Utah GLX project is developing drivers for these chipsets as well.

NVIDIA Reference Drivers ( based on Mesa 3.0 )
Developer version of Linux X-Windows and MESA/GLX accelerated drivers.
Support for their line of 3D chipsets ( Riva128, TNT, TNT2, TNT 2 Ultra, GeForce 256 )
For the GeForce 256 there is 2D support and basic 3D drivers.

You can also find RPMS at ftp://ftp.mesa3d.org/mesa/misc/nVidia/.

On a personal note, I am running Mandrake 7.0 on my computer with a GeForce 256 and the card WAS detected during install and runs X perfectly.

Riva X Server F.A.Q.

GeForce drivers released Posted Friday, January 7 18:18 by kornel
nVidia released new drivers for their chipsets including the GeForce!!

Grab them over here.

NVidia opens driver sources Posted Tuesday, August 17 10:00 by armin
NVidia is now offering the driver sources for their TNT/TNT-2 chips, you can access them here at their OpenView page, including an OS development kit for Linux. Good job there, NVidia, makes me proud to own your stock :)