HAMM - A utility that allows you to edit Descent 1 and 2 HOG files. - http://members.ozemail.com.au/~prunge/
DTX - A tool to extract and replace graphics, sound and music for Descent I. - http://www.cybertrash.com/shareware/dtx/
File Type Specifications - Includes specs, editors, information, and other resources for Descent development of various data files in Descent 1 and 2. - http://descent2.com/ddn/
Descent Manager - A multi-function set of utilities for editing many aspects of Descent 1, 2, and 3, and FreeSpace 1 and 2. - http://descent2.com/descman/index.html