HLE 3DS emulator
RetroArch is a frontend for emulators, game engines and media players.
Cemu is a Wii U emulator
DeSmuME is a Nintendo DS emulator
The quadplay fantasy console
WebSocket emulation and Javascript client
Versatile Commodore Emulator
Run Windows applications on Linux, BSD, Solaris, and Mac OS X
A multi-purpose emulation framework
C64/Amiga emulator with PAL shader and runAhead
C64 Emulator
Python front end for MAME that can run in Linux, Windows, and MacOS
Software development for 4Mb portable, using Z80 CPU and AA batteries