TempleOS

The idea of a barebones programming sandbox attracted me to this, but then reading through the rest of the site I felt like it was an attempt at sublime evangelism using Biblical passages as allegory for programming philosophy that then rambles on into a testimonial blog post.

I like resources such as the source code by address page, and the lack of complicated structures that get in the way of kernel programming, and I think it would still be fun to dig through the I/O and process management code when I have time to translate the naming paradigm so I can follow it.