Those files were created using the Blender Game Engine over the years. We use this game engine since 2003. It's recommended to download the respective Blender version for your platform if you want to test the available files bellow.
If you are not familiar with the Blender Game Engine, we suggest you to visit our most extensively documented project "Aerial Machines" to begin your journey.
BLENDER RELEASE INDEX LINK
Made in Blender 2.49b
OpenGL Guy, 2011
The Ankh of Isis, 2014
Made in Blender game engine version 2.71
Made in Blender Game Engine 2.69