Ali Kazim

Progressive web app let user feel like a natural app on the device, with an immersive user experience. This plugin helps site administrators to quickly enable pwa for their sites just by activating this plugin.
Read Detail: https://developers.google.com/web/progressive-web-apps/
Features:
<ul>
<li>Add to Home Screen Button</li>
<li>App Icon</li>
<li>Splash Screen</li>
<li>Caching</li>
</ul>
Pro Version:
<ul>
<li>Web Push notifications</li>
<li>Advanced caching</li>
<li>WooCommerce Support</li>
</ul>
Requirement:
<ul>
<li>SSL certificate must be installed</li>
</ul>

PWA By Intelvue

adaptsites

This plugin uses the Workbox Library https://github.com/GoogleChrome/workbox to turn your website into a progressive web app.
Add to homescreen code was incorporated into this plugin from: 
Add to Homescreen v2.0.11 – Copyright (c) 2013 Matteo Spinelli – Released under MIT license

Installable

This plugin uses the Workbox Library https://github.com/GoogleChrome/workbox to turn your website into a progressive web app.

PWA By Intelvue vs Installable