Basically a small sample selection of textures from the Duke Nukem 3D HRP (licensed under the GPL) and a sample map to go with it. One thing lacking from Sauer was modern city textures, it is rather difficult to build good looking interiors and exteriors using any of the textures supplied with Sauer. To rememdy this I decided to test Duke Nukem 3D-like textures to see if they worked, and I beleive they did.
Go to http://hrp.duke4.net/ for more textures. The license allows distribution this way and we have the blessing of 3D Realms so use them however you please (within the terms of the license of course ;)!