I love using macOS as my personal OS.

And I really like NixOS and it's nix package manager.

Interesting

• ​QubesOS​

• ​Plan 9​

Links

• ​Introduction to Operating Systems​

• ​OS: Three Easy Pieces​

• ​mirageOS - A programming framework for building type-safe, modular systems.

• ​OS Dev​

• ​Raspberry Pi OS - Learning operating system development using Linux kernel and Raspberry Pi.

• ​Create OS from scratch​

• ​How to Make a Computer Operating System​

• ​Plan 9 from User Space - Port of many Plan 9 libraries and programs to Unix.

• ​Jehanne - Simple operating system.