AddEvent is used to Add to Calendar and event tools for websites and newsletters.
cdnjs is a free distributed JS library delivery service.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Imperva is a cyber security software and services company for networking, data, and application security.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.