Windows 95 in Electron. Runs on macOS, Linux, and Windows
Virtualization software for x86_64 hardware
Emulator that can run 32-bit Windows programs/games
Game Boy / Game Boy Color / Super Game Boy emulator, debugger
A cross platform, customizable graphical frontend
Run Windows applications on Linux, BSD, Solaris, and Mac OS X
JavaQemu was my GUI Front End project for QEMU, written in Java.