The Topogun mesh re-topologization and map baking tool is about to hit version 2.0 for Windows, Linux, and Mac OSX. Max Underground has a nice look at the beta, showing what you can expect in the full release when it comes out.
Topogun offers almost a full pipeline for retopologization and map baking, with the exception of UV creation tools (which might not be a minor issue for some users). You can also use Topogun 2.0 for retopologizing your concept sculpt and then use subdivision tools to create a hi-res, wrapped mesh that captures the details automatically and then continue sculpting on the cleaned up hi-res mesh in your sculpting application.
