Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
EmailJS is a cloud-based email delivery service that allows you to send emails directly from your client-side JavaScript code without the need for a server-side implementation.
ipify is a service which provide public IP address API, IP geolocation API, VPN and Proxy detection API products.
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.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.