Google APIs are application programming interfaces developed by Google which allow communication with Google Services and their integration to other services.
Using this tag you can set up your web app to have an application shortcut icon added to a device's homescreen, and have the app launch in full-screen "app mode".
Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
A rich hosted Exchange environment for every user without having to manage a server.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Chrome for Android, since version 39 supports the "theme-color" meta tag to allow websites control the background color of the tab's UI header.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Google's hosted library for web fonts. Allows websites to choose and use fonts from a free, wide variety of fonts.