Thanks to Thomas McGuire of 3dSpotlight for informing me that 3dfx Gamers has posted BETA Voodoo 4/5 drivers for Windows NT 4.0.
Voodoo Series(tm) Driver Kit Version: 1.00.00 BETADownload
Voodoo Display Driver and Miniport: 4.00.1381.0229
Glide(tm) 2.X Driver: 2.61.00.0658
Glide 3.X Driver: 3.10.00.0658
OpenGL(r) Driver Version: 1.0.0.0740
3dfx Tools Version: 2.6.1.110