This is a suite of tools developed by CG Cookie that brings several dedicated retopology tools to Blender.
Tools in development:
- Contours
- Poly Strips
- Poly Patches
- Cut
Tool Documentation: http://cgcookie.com/blender/docs/contour-retopology/
Support Forums: http://cgcookie.com/blender/forums/forum/contour-retopology-tool/
Tool Design Doc: https://docs.google.com/document/d/1C2umhGBQPmCygpqoKkXLTPT4d0_0Q_3k7HbQCZaFjKI/edit#