The third generation GeForce: NV20 is the 'vanilla' and first version of the GeForce 3 series. Other models; the Ti200 which is slower, and the Ti500 which is faster exist too.

nVidia released the Zoltar techdemo for the GeForce 3 to show it's capabilities and programmable shaders. In the past nVidia also wrote demo's for the GeForce 256 and the GeForce 2 but in my opinion the Zoltar-techdemo is the first mature one. All the other demo's were just used to show examples of new techniques or possibilities where Zoltar is actually interactive.

The NV2A is based upon the NV20 and is used in the Xbox.