QubesOS is known as a secure operating system (tag line "A reasonably secure operating system" :D). Yomimono, hannes and I worked on a lightweight firewall for QubesOS, based on the original by Thomas Leonhard. Via packet filter rules, a firewall restricts unwanted access to the network, and is an important part of the security concept. QubesOS allows the user to run applications in different, separate virtual machines. An attack, for example on the browser, is then limited to the virtual machine the browser runs on.
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In March 2018, I attended my first MirageOS hack retreat in Morrocco. MirageOS is a library operating system which allows everyone to build very small, specialized operating system kernels that are intended to run directly on the virtualization layer. It is written in OCaml and each kernel is built only with exactly the code that is necessary for the particular application. A pretty different approach from traditional operating systems. 
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Let's Encrypt is an awesome, free and automated certificate authority if you want to get SSL certificates to serve over https. I use acmetool to get my certs from them.
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Mammutmarsch 2016, 100 km in 24 h, on foot. Two friends in my Timeline were writing about it and I wrote "That sounds like a challenge, should I click yes?" Yes. Click. What did I get myself into?
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You can create art and beauty in JavaScript.