I keep linking panda3d throughout this section of the forums when users request a 3D alternative to rpgmakers.
Panda3D is a free 3D engine. No its not a game maker in the sense that nothing is written for you, you will have to get your coding fingers out and start typing. It supports a wide range of 3D model formats allowing you to make pretty much anything.
Linkits not bad in terms of graphics either: