id's BSP Utilities
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Description:

qbsp3.exe = Converts a .map file into a .bsp file which can be used by the game.

qvis3.exe = Builds potentially visible set information for a .bsp to accelerate 
rendering and qrad calculations.

qrad3.exe = Builds lightmaps for a .bsp file.  If the PVS has not been generated, 
only direct lighting is considered.  Otherwise, a radiosity solution is done.

bspinfo3.exe = Dumps information on a bsp file.

Usage:

qbsp3 (map name)
qvis3 (map name)
qrad3 (map name)

bspinfo3 (map name)