I've been working with B2.8x sculpt features and thought it might be a good idea to look at retopo techniques. I found some tutorial videos from Flipped Normals that might be of interest. These guys show how do retopo without an addon. It goes pretty well once you learn the techniques.

They have a for beginners retopo video, a face retopo demo, and a full-character workflow video.

Also, they have one for the Polybuild Retopo Tool that was added in B2.81.

It's good stuff!