Chosen is a jQuery plugin that makes long, unwieldy select boxes much more user-friendly.
Contao is an open source CMS that allows you to create websites and scalable web applications.
Headroom.js is a JS widget that allows you to react to the user's scroll. The header slides out of view when scrolling down and slides back in when scrolling up.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
PHP is a general-purpose scripting language used for web development.
Reveal CSS animation as you scroll down a page.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.