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.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.
WooCommerce is an open-source ecommerce plugin for WordPress.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.