I've kind fo been wondering thsi for a while, because I'm into mapping for the source engine with the Hammer editor. Does anyone know, if they do, where I could get said program?
[Edited on 05.09.2010 5:03 PM PDT]
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To general of a question; but they use Sapien and Gorrilla for their "map" design, if that is what you mean. They are coded in house and are a part of the game engine, on the tools side. You can get the Halo 1 version with Halo CE.