1)   Action3D Reducer Demo 1.1
Action3D Reducer is a great polygon reduction tool that changes the level of detail in real-time and creates both .3ds and .x files.
polygon reducer, polygon reduction, action3d, action3d reducer, progressive mesh, polygonal simplification, edge contraction, .3ds, .x, 3D object,

 2)   VizUp Professional 3.0.7
VizUp Reducer Professional enables you to reduce the number of polygons in a complex 3D model while retaining the quality and appearance of the original. Supports Wavefront .OBJ, VRML 2.0/97 and StereoLitho (.STL) file formats.
3D reducer, 3D optimizer, CAD, animation, architect, 3D design, 3D art, VRML, 3D compression, 3D reduction,

 3)   VizUp Reducer Enterprise 3.0.7
VizUp Reducer Ultimate is designed for optimization of complex 3D models (CAD/CAE systems) for real-time visualization. Supports Wavefront .OBJ, VRML 2.0/97 and StereoLitho (.STL) file formats.
3D reducer, 3D optimizer, CAD, animation, architect, 3D design, 3D art, VRML, 3D compression, 3D reduction,

 4)   VizUp Reducer 3.0.7
VizUp Reducer is designed specially for game developers, architects, and 3D designers. With this software in place, they can reduce polygons and optimize 3D models. Supports Wavefront .OBJ, VRML 2.0/97 and StereoLitho (.STL) file formats.
3D reducer, 3D optimizer, CAD, animation, architect, 3D design, 3D art, VRML, 3D compression, 3D reduction,