Apache is a free and open-source cross-platform web server software.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
MathJax is a cross-browser JavaScript library that displays mathematical notation in web browsers, using MathML, LaTeX and ASCIIMathML markup.
TYPO3 is a free and open-source Web content management system written in PHP.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.