cdnjs is a free distributed JS library delivery service.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
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.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
SmtpJS is a free library you can use for sending emails from JavaScript.
Sucuri is a cybersecurity company that provides website security solutions and services.
Unpkg is a content delivery network for everything on npm.