Giga Games 5 CDROM, May 1997.  Walnut Creek CDROM.
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 Descent Editors
 path: \descent\editors 
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dcntspec.zip This file is for people that would like to cheat at the Registered Version of Descent. This file contains hex addresses that apply only to the registered version.
devil102.zip DEVIL 1.02 - An editor for the Parallax game Descent. You need: FPU, VESA-compatible graphics card (or S3), Descent registered version and lots of time. Just unzip DEVIL102.ZIP in your DESCENT directory with -d.
dtx100.txt   
dtx100.zip   
hogutil.zip  HOGUtil v1.0 This program allows you to list, add, extract, and delete file elements from the HOG files used by Interplay's Descent game.
lvlinfo.zip  This document describes the level and mission format for the registered version of Descent. It is hoped that this information will help people create their own levels and missions for use with Descent. This document is not complete without the attached source code.
makehog.zip  MakeHOG is a utility program that can be used to combine multiple user-generated Descent levels into a single HOG file. This HOG file, when used in conjunction with a Mission file (.MSN file), will be recognized by Descent and will show up in its StartGame menu. This MSN/HOG file combination is the method recommended by Parallax Software when distributing new Descent levels.
rdlview.zip  Simple Descent *.RDL file browser. Should be fairly good basis for an editor.