From the company's website [link now resolves to TRAINZ]: (www.auran.com/d20/)
Auran’s d20 Adventures are a unique line of roleplaying adventure modules enhanced with 3D digital scenes. The adventures are designed to be incorporated easily into most fantasy roleplaying worlds.
Auran's d20 adventure modules combine traditional tabletop roleplaying with a range of PC based digital enhancements. Each adventure will include the following:
* 60+ page adventure module
* Full color maps
* Player handouts
* 3D scenes depicting key locations in the adventure
* The complete adventure module in searchable PDF format
* Ambient sound effects
* Printable color maps
* Printable color game handouts
* Background to the author and the development team
The digital enhancements are not required to play the Auran d20 Adventures. The enhancements provide the DM with a powerful set of resources to present the game in a new and exciting format that will enrich the traditional roleplaying experience.
Note: Auran d20 Adventures is associated with Auran Games, an Australian studio that produces electronic/video games, including the popular title Trainz Simulator