Calendly is an app for scheduling appointments, meetings, and events.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Lucky Orange is a conversion optimisation tool with features including heatmaps, session recording, conversion funnels, form analytics, and chat.
Open Graph is a protocol that is used to integrate any web page into the social graph.