Torque 3D is the best full source, low cost solution out there. It is also our flagship engine built on the core strengths of our Front Line Award-winning Torque Game Engine Advanced. Torque 3D has been re-architected for maximum flexibility and performance across a wide-range of hardware. Torque 3D comes equipped with a full suite of tools to allow your team to excel and produce high-quality games and simulations. With deployment paths to PC, Mac, Linux, you have the power to distribute games wherever they are played.
This is an in-engine shot of the Sector T3D demo included with Torque 3D.