It&#x27;s not &quot;an app&quot;. It&#x27;s an Operating System that runs on bare hardware, <i>and</i> the applications one would need. It aims to do the useful work that a word processor, DTP program, drawing program, web browser <i>and</i> the file system, drivers, rendering sub-system, networking stack and much more does. <i>All</i> in ~20kLOC.<p>I seem to recall they support full unicode, by the way (which makes sense today, there&#x27;s not many good reason to not try for full utf-8 compliance unless you want to do some entirely different encoding (like a simpler, prefix-based one) and then do conversion at the edges of your system)).