Here are some links that may be of interest for those wishing to develop levels or mods for Descent 1 and 2. The links include tool download sites, tool homepages, and developer resource sites and forums. Some of the pages no longer exist, but their content can be accessed using the Wayback Machine ( http://www.archive.org/ ).
http://descent.brainware.net/
Descent Mission Builder
http://www.descent2.com/
Descent Network Site
http://archives.descent.cx/
The Descent Archives
http://www.koolbear.com/Descent/Devil/ (Use Wayback Machine)
Achim Stremplat Homepage – DEVIL Editor Creator
[url=http://members.ozemail.com.au/~prunge]http://members.ozemail.com.au/~prunge[/url]/
HAMM Homepage
http://www.cybertrash.com/shareware/dtx
DTX Homepage
[url=http://home.earthlink.net/~magneton/devil.html]http://home.earthlink.net/~magneton/devil.html[/url] (Use Wayback Machine)
DEVIL Training Page
http://www.toto.com/JeffFerguson/DStudio/ (Use Wayback Machine)
Official Descent Studio Web Site
http://www.descent-3.com/garry/ (Use Wayback Machine)
Garry's Descent Page (Rbotedit Info)
http://ourworld.compuserve.com/homepages/MicahJon/homepage.htm (Use Wayback Machine)
Micah's Descent Tools Home Page
http://www.ladder.org/ddr/ (Use Wayback Machine)
Descent Developer Resources
http://www.l7square.com/dmb2guide/
DMB2 Resource Guide
http://www.descent2.de/dle-xp-intro.html
DLE-XP Homepage
http://www.descent2.de/forum/
DLE-XP Forum
http://hjem.get2net.dk/dittehus/lac/devil1.htm (Use Wayback Machine)
Lars Christensen DEVIL Pages with source code and Luke Schneider DEVIL Tutorial
http://www.descentforum.de/forum/viewforum.php?f=17
German language Descent Level Design Sub-forum
http://www.descentbb.net/
Community Site with Descent development sub-forums
http://www.planetdescent.net/
Community Site with a Descent development sub-forum

Rysa, can you sticky this post? Thanks