I need to develop a web site that includes interactive CAD activities. I want to be able to use VB.NEt as the development tool but the resulting web app needs to be accessible from as broad of a client platform base as possible. This seems to preclude the use of any activeX based engines (of which I have found some that would do what I want except the platform independence). Are there any CAD engines out there that will work with most types of web browsers on a broad variety of target platforms? Are there any that support 3D?