reactos / reactos

An open-source, Alpha-stage operating system that aims for binary and driver compatibility with Windows NT-family applications.

utmapp / UTM

Full system emulator and virtual machine host for iOS, macOS, and visionOS, built on QEMU.

HarbourMasters / Shipwright

A PC port of The Legend of Zelda: Ocarina of Time that runs on modern systems, built on a decompilation and a custom libultra-compatible library.

mit-pdos / xv6-riscv

A teaching operating system: a re-implementation of Unix Version 6 in ANSI C for RISC-V multiprocessors, running on QEMU.