TopoGun is a specialized retopologizing application. It contains two main modules: TopoGun:3D and TopoGun:2D.
You can import highres scanned models or just any other 3D model you wish to retopologize in TopoGun:3D and create a lowres to midres animation ready mesh. TopoGun:2D handles the dispmap, normal map and ambient occlusion map creation. Furthermore, you can divide the TopoGun:3D midres mesh in TopoGun:2D and "conform" it on your original highres model, recovering the full range of high frequency detail you initially had.
Another cool feature TopoGun:2D has is the texture transfer from the highres model to the retopologized mesh.
TopoGun can be used in games asset creation pipelines(its main target) or in any other pipeline that involves 3D retopologizing requirements.
Its price will be low enough so that any 3D enthusiast can afford.
Right now, a beta version of TopoGun is being prepared. However, it will ONLY include TopoGun:3D and initially no documentation will be available.
TopoGun 1.3 beta has some powerful features, such as the maps baking and highres mesh recovery extensions. Have a look at the next video and watch the process of creating a fully functional Mudbox scene from a very lowpoly retopologized cage and a highres reference mesh.