This retro enthusiast forced Windows 11 to run on a Core 2 Quad Q6600 and AGP graphics

Can Windows 11 run on a 2003 motherboard, an AGP GPU (for those not old enough, that's the slot that predates PCI Express) ...
Tom's Hardware on MSN

HamsterOS jams a 32-bit GUI operating system in a 1.44 MB single floppy for 386-era hardware

HamsterOS fits on just a single 1.44 MB floppy disk, and it's set for a full release this November.
GitHub

An experimental operating system fully written in Rust, with a unikernel design, cooperative scheduling and a security model based on WASM sandboxing.

Munal OS started as a toy project to practice systems programming, and over the years morphed into a full-blown OS and a playground to explore new ideas. It aims to re-examine principles of OS design, ...