Check out a useful tool for retopology in Maya. 

This plugin for Maya called ziRail creates patch polygons along your strokes that are drawn directly on a mesh. Basically, the tool makes creating polygons more intuitive becoming an essential companion tool for retopology tasks.

Please note that it is still a beta version and the team promises to release free updates. The plugin support Maya 2018, 2019, and 2020 for Windows (Linux and macOS versions are in development).

Includes: 

• .mll plug-in files for supported Maya versions
• .py Python files for UI and main functions

You can learn more and get the tool for $27+ here.