I started this as an experiment. I wanted to see how easy it would be to integrate some kind of push notifications into CMSMS. CGWebPush is the result of that experiment. It integrates with the FrontEndUsers module and allows administrators to send text push notifications to subscribed FEU users, even when they are not logged in to your website.
This is a great way to keep in touch with your users, and keep them interacting with your website.
This module is currently in its infancy. Soon I will be adding image support, and the ability to automate push notifications, however this module already integrates with cmscli and allows a base level of automation.