Apache is a free and open-source cross-platform web server software.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
NitroPack creates optimised HTML cache for fast page loading experience.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Varnish is a reverse caching proxy.
WPML plugin makes it possible to build and run fully multilingual WordPress sites.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.