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Bootstrap (UI frameworks)

Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

Calendly (Appointment scheduling)

Calendly is an app for scheduling appointments, meetings, and events.

cdnjs (CDN)

cdnjs is a free distributed JS library delivery service.

Cloudflare (CDN)

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

Google Hosted Libraries (CDN)

Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.

Google Tag Manager (Tag managers)

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.

HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.

jQuery UI (JavaScript libraries)

jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery, Cascading Style Sheets, and HTML.

Moment.js (JavaScript libraries)

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

reCAPTCHA (Security)

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

Select2 (JavaScript libraries)

Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.

Unpkg (CDN)

Unpkg is a content delivery network for everything on npm.