RACER
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valvetronic #251 Windows 2000/XP/2003-Server; Pentium III or AMD processor. Anything from 800Mhz and up will probably do (Pentium II may be supported, but it is probably quite slow).
Note that the beta versions DO NOT support Windows 95/98/ME anymore (trouble with fonts).
A good 3D graphics card (supporting OpenGL and Cg) like from nVidia or AMD/ATI. Onboard graphics often aren't good enough (no support for cubemaps), and also older graphics cards may not support Cg.
DirectX8.0 or better. Actually, for NT4, only DINPUT8.dll seems to be needed; copy this file from another computer into the Racer installation directory (thanks to Rob Anderson for providing this information).
A network driver.