Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Embedly is a service that allows developers to convert URLs into rich previews and embeddable content.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
iubenda is a compliance software used by businesses for their websites and apps.
Open Graph is a protocol that is used to integrate any web page into the social graph.