http://www.revheadz.com.au/
Developers of the state of the art sound simulation app called RevHeadz Engine Sounds.

http://www.wheelspinstudios.com/
Independent game development business which I work on.

http://www.polybuilt.com.au/ (Provided all of the car models for Driving Speed 2)
Polybuilt is a reliable source of content creation for 3D games. Anything from environments to vehicles on any platform. Years of experience with the most popular 3D applications and game development make Polybuilt your final destination for outsourcing content creation.

http://www.virtual-mechanix.com/ (Provided the Audi R8 LeMans car for Driving Speed 1)
Virtual Mechanix is a leading supplier of 3D vehicle models for the interactive games industry.

http://www.v8gaming.com/
Home of the V8 Supercars mod for rFactor and authors of the Adelaide and Bathurst tracks used in Driving Speed.