Apache is a free and open-source cross-platform web server software.
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.
PHP is a general-purpose scripting language used for web development.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Sulu is the go-to CMS for back-end projects written within the PHP Symfony framework.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.