PC
7 projects: 0 decompilations, 0 static recompilations, and the rest ports, rewrites and clean-room builds.
Box64
x86-64 Linux userland binaries
Dynamic recompiler that runs x86-64 Linux programs on ARM64 and RISC-V, forwarding library calls to native libraries.
FEX
x86 and x86-64 Linux binaries
Usermode x86 and x86-64 emulator for ARM64 Linux with a JIT and library thunking, used to run PC games on ARM.
FreeDOS
MS-DOS
Complete MS-DOS-compatible operating system for running classic DOS software and games.
Haiku
BeOS
Open-source operating system that recreates BeOS and stays compatible with its applications.
osFree
IBM OS/2
Effort to build an open-source OS/2-compatible operating system, starting with its user-mode parts.
ReactOS
Microsoft Windows NT (Server 2003 era)
Free operating system written from scratch to be binary-compatible with Windows NT drivers and applications.
v86
x86 PC hardware
x86 PC emulator that JIT-compiles guest code to WebAssembly and boots DOS, Linux, BSD and other systems in the browser.