In 2005 and 2006 I was employed at a company which wanted to create a 3D application using a game engine, but they also wanted it to be accessable over the web. My job for a few months was to work on converting the GarageGames Torque Game Engine (TGE) to work in the web browser.
At the same time they also allowed me to make it accessable to people who have bought the GarageGames engine. If you own the license then you can freely download and update the code from the Torque Developer Network.