I was reminded of North Korea's Red Star OS the other day while reading something entirely unrelated and I thought I'd look up some videos of the OS being installed and used. The operating system was somehow leaked a few years ago despite the country's closed borders and some immediately went to installing it just to see what it was all about.
It turns out that Red Star OS is a Mac OS-like skin on top of a highly-modified Linux operating system. It has some really odd programs on it (some which potentially can call home to North Korean servers) and it is basically unusable compared to modern OS's. Still, it's an interesting piece of software from a country that is notoriously difficult to peer into.