Apache is a free and open-source cross-platform web server software.
BEM (Block, Element, Modifier) is a naming convention for classes in HTML and CSS what was developed by Yandex.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.