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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.

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.

Cloudflare Browser Insights (Analytics, RUM)

Cloudflare Browser Insights is a tool that measures the performance of websites from the perspective of users.

Google Analytics (Analytics)

Google Analytics is a free web analytics service that tracks and reports website traffic.

Gravatar (Miscellaneous)

Gravatar is a service for providing globally unique avatars.

jQuery (JavaScript libraries)

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.

MySQL (Databases)

MySQL is an open-source relational database management system.

PHP (Programming languages)

PHP is a general-purpose scripting language used for web development.

reCAPTCHA (Security)

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