LuxMax

Luxmax is the 3ds Max to Luxrender exporter.
Its a full script "suite" with custom materials/textures/lights/helpers/cameras/exporter that allow you to use the amazing open source renderer Luxrender.
This big project was a collaboration mainly between 3 people.
Guillaume Plourde
Konstantinos Mourelas
Stig Atle Steffensen

You can find the script package and its documentation in Luxrender website, wiki and forum.