A Modern OS in just 1.44MBs

This is KolibriOS, a modern operating system that only requires 12 MB of RAM to run, and according to their wiki, it features a monolithic preemptive kernel that is less than 100 kilobytes in size. This OS also comes with a lot of interesting pre-installed applications that you can try.

https://kolibrios.org/en/
https://git.kolibrios.org/