Apache is a free and open-source cross-platform web server software.
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.
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.
ipapi.co is a web analytics provider with IP address lookup and location API.
PHP is a general-purpose scripting language used for web development.
Typekit is an online service which offers a subscription library of fonts.