https://doc.callmematthi.eu/
This is basically a personal documentation (mostly about Linux and related topics) that I've decided to share with the world, since most of it comes from the Internet. It's a collection of "HowTo's", tips, and numerous details about computing that I'm happy to read again after forgetting them.
Under the hood, it's written (with Emacs) into XML files, and rendered to HTML by XSL style sheets. The online version is completely static and is served by Nginx + Varnish.