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.
Glide.js is a dependency-free JavaScript ES6 slider and carousel.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Personio is the all-in-one HR software for small- and medium-sized companies with 10 to 2000 employees.
PHP is a general-purpose scripting language used for web development.
TYPO3 is a free and open-source Web content management system written in PHP.