TopoGun is a stand-alone resurfacing, and maps baking application. The resurfacing functions in TopoGun will help you modify and/or recreate the edgeflow of your digital 3D models. The maps baking functions, will help you bake various types of texture maps from your high resolution 3D models and then allow you to apply them to your newly created optimized meshes. These texture maps contain information that will help you recover the appearance and features of the original high resolution mesh.
TopoGun is a standalone application available for Windows, OS X, and Linux operating systems. TopoGun licenses are cross-platform and after buying one, TopoGun can be installed on any of these operating systems. Topogun is $100