This is pretty cool. https://github.com/wjakob/instant-meshes

I don't know how the quality of its output compares to 3DCoat, Blender, ZBrush, or other applications offering retopology, but this one is free -- and much more straightforward than Blender.

You have to scroll down a bit to find the precompiled binaries downloads. The link at the top is for the source code.

===========================sigline======================================================

Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.