jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.

Moment.js is a free and open-source JavaScript library that removes the need to use the native JavaScript Date object directly.

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.

LiteSpeed is a high-scalability web server.

Fastly is a cloud computing services provider. Fastly's cloud platform provides a content delivery network, Internet security services, load balancing, and video & streaming services.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

GitHub Pages is a static site hosting service.

Varnish is a reverse caching proxy.