Gizmo has released some Glide drivers that fix the problem of OS hangs after exiting Glide applications/games. Here are some words from him:
These drivers: Glide3x.dll and Glide2x.dll originally from hujer_hoe, I just got glide to work without freezing on exit, sacrificing OpenGL but you can always switch Glide3x.dll and Glide2x.dll without restarting.. These drivers go in "c:Windowssystem32" basically where your current ones go.
Should work for Voodoo 3,4,5 but tested only on Voodoo5. These drivers have been tested and work for:Warzone 2100, UnrealTournament, and Tribes1 without crashing on exit or just plain work.