A simple Perl wrapper around the Google Maps API. It allows you to easily create maps with markers, polylines and information windows. You can now look up locations around the world without having to install a local database.
It appears that Apple may be working on adding service workers support to WebKit. The WebKit Feature Status webpage has recently been changed from "Under Consideration" to "In Development." This change may be an indication that Apple will eventually support Progressive web apps (PWAs).