DX Studio is a complete integrated development environment for creating interactive 3D graphics. The system comprises of both a real-time 3D engine and a suite of editing tools. Using DX Studio you can build complete real-time interactive applications, simulations or games, for standalone use or for embedding in other Microsoft Office/Visual Studio applications.
I decided to give this engine a try after I got tired of using Unity 3D Indie version and all of it's limited features.
This engine is very solid, and offers a lot more for free than Unity, but the speed is decreased drastically.
I haven't yet to deeply delve into all of the features yet but there are many things going for it, like the mesh browser, which allows you to download mesh from an online list directly in the program, and download them on the spot directly in to your scene too.
Overall I gave it a 9/10. Very solid and easy but slow and not as straightforward.