This site uses the viewport meta tag which means the content may be optimized for mobile content.
Google+ Sign-In button allows users to authenticate on websites using their Google+ account.
Authentication and authorization services for web, mobile, and legacy applications
Google+ platform websites integration using the Google+ platform tag.
Google APIs are application programming interfaces developed by Google which allow communication with Google Services and their integration to other services.
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.
Google's hosted library for web fonts. Allows websites to choose and use fonts from a free, wide variety of fonts.