Instant Meshes -- Must Have Free 3D Retopology Tool - YouTube
Quad Remesher auto-retopology add-on released for Blender [$] - BlenderNation
Blender 2.8 free retopology addon and tutorial - BlenderNation
A True Retopology Shader for the Modeling Viewport — Right-Click Select
SpeedRetopo - Blender Market
RetopoFlow 3.0 Addon: a suite of retopology tools for Blender 3.0 - YouTube
8 Blender Addons for Retopology - YouTube
Awesome Blender Addons for Retopology | Blender Cloud Rendering
Retopo MT - Blender
GitHub - LokiTheCuteBear/RetopoView: A small Blender addon that enables drawing colourful overlays over meshes for user-defined face groups - for marking topology flow during retopology/studying topology.
QuadWrap- Retopology Tool - Released Scripts and Themes - Blender Artists Community
SoftWrap - Dynamics for retopology. - Blender Market
Automatic retopology using Instant Meshes - STYLY
8 awesome Blender Addons for Retopology - InspirationTuts