AddEvent is used to Add to Calendar and event tools for websites and newsletters.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
SiteGround is a web hosting service.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
UIKit is the framework used for developing iOS applications.