The Doom Hacker's Guide

The Doom Hacker's Guide is a 299-page book written by Richard H. "Hank" Leukart, III, published by MIS:Press, and released on March 1, 1995. The book was packaged with a CD-ROM containing the following editing programs for the original Doom and Doom II: The included CD also contained various custom made DeHackEd files, as well as additional levels, and graphic and audio add-ons.
 * DeHackEd (version 2.2, DOS)
 * Doom Editing Utilities (DEU) (version 5.21, DOS)
 * NewWADTool (version 1.3, DOS)
 * DoomCAD (versions 4.3 and 5.1, Windows)