Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Drupal is a free and open-source web content management framework.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.