BlueStacks - BlueStacks is a website designed to format mobile apps to be compatible to desktop computers, opening up mobile gaming to laptops and other computers. Read more about BlueStacks.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Android-x86 - Run Android on your PC.
mGBA - mGBA is an open source emulator of the Game Boy Advance. The goals are speed and accuracy.
YouWave - Runs Android apps and app stores on your PC, no phone required
DeSmuME - DeSmuME is a freeware emulator for the NDS roms & Nintendo DS Lite games created by YopYop156.