cdnjs is a free distributed JS library delivery service.
Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
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.
Internet Information Services (IIS) is an extensible web server software created by Microsoft for use with the Windows NT family.
Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.