Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Smart Ad Server is an adserving and RTB platform.
Varnish is a reverse caching proxy.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.