It is a Woocommerce plugin that let you calculate shipping costs based on a users zip code, and display them next to the product price
You'll need an API key for the Geolocation/Distance Matrix APIs. Get it here.
Google Distance Matrix - Introduction
Adding Extra Info with Price in Woocommerce
How to Geocode an Address in Google Maps Javascript
Google Distance Matrix JSON shortest path (PHP)
Get driving distance between two points using Google Maps API