From Valve Developer Community
Revision as of 22:55, 5 December 2009 by MrTwoVideoCards (removed hacked version, not even authored by original author.)
Valve Map Extractor (VMEX) is a decompiler for Source engine maps. It converts BSP format files back into VMF format maps that can be loaded into Hammer. Since version 0.98g it supports all of Valve's games up to Left 4 Dead.