From this Ars Technica article:
ORBX.js was developed by a company called OTOY. OTOY's major product is Octane Render, a 3D renderer that works exclusively on NVIDIA cards using CUDA. Working with customers including Autodesk, OTOY has developed technology to allow applications such as Autodesk's 3ds Max modelling software to be accessed over the Web without using plugins.
(Continue reading over at ArsTechnica.com)