Doctor Who: Adventures in Time and Space roleplaying game, as well as Rocket Age and the Primeval roleplaying game. A third party game has been released using the system, Pulp Fantastic. This site is a place to find resources for those games and the games to come that will use the system.
Formally known (unofficially) as the George System, the DWAITAS System, or the Saturday Afternoon Tea Time Adventure System, Vortex is a lightweight rule system- Attribute + Skill +/-Trait (if applicable) + 2d6 = Result. If Result greater than TN, success.