Tesselator – Quadrilateral Remeshing for Blender

Tesselator by Flow Tools creates a low-poly quad mesh from a high-poly 3Dscan or sculpt in Blender by distributing particles evenly across the surface then connecting them with clean loops.

The tool can generate quads, triangles or quad-dominant remeshes. Options include symmetry, “grease-pencil” guides to direct loop flow, and high-poly painting for areas that need more detail.

The author states Tesselator’s auto-remesher is not a replacement for manual retopology, but for $8.50 it seems like an indispensable tool for low-poly baking and figure creation.

https://www.blendermarket.com/products/tesselator

Topogun2

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
http://www.topogun.com