I'm sorry NixOS, I've failed you.
Running an operating system in your web browser is easier than you might think, and there are a few options you can try right now.
Mozilla likes to describe Firefox OS as an open alternative to existing smartphone operating systems. You can run the mobile operating system on pretty cheap hardware. It’s open source and ...
MicroPythonOS lightweight OS for microcontroller targets applications with graphical user interfaces with a look similar to Android/iOS.
Ariel OS is a new RTOS for microcontrollers written in Rust with support for popular hardware architectures (Arm Cortex-M, ...