DeSmuME - DeSmuME is a freeware emulator for the NDS roms & Nintendo DS Lite games created by YopYop156.
melonDS - A Nintendo DS emulator with support for commercial games.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
mGBA - mGBA is an open source emulator of the Game Boy Advance. The goals are speed and accuracy.
Citra - Citra is a work-in-progress emulator for the Nintendo 3DS.
OpenEmu - Console and Arcade video game emulator for macOS.