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What is RetroArch?RetroArch is a modular multi-system emulator system that is designed to be fast, lightweight, and portable. It has features few other emulators frontends have, such as real-time rewinding and game-aware shading.

ZSNES is a Super Nintendo Entertainment System emulator. Aside from emulation accuracy, many interface features first introduced in ZSNES have been adopted by other emulators. ZSNES interface features include: Smoothing and dynamic image scaling; screenshot capture; state saving; recording ZMV movies; increasing/decreasing game speed; ripping SPC700 sound files; integrated Game Genie\Pro Action Replay\GoldFinger cheat code support, decompression of JMA files; "NetPlay"; and GUI themes.

VisualBoyAdvance (VBA) is a free software (GNU GPL) emulator targeted for the Game Boy, Super Game Boy, Game Boy Color, and Game Boy Advance handheld game consoles sold by Nintendo.

Open Emu is an open source project to bring game emulation to OS X as a first class citizen, leveraging modern OS X technologies such as Cocoa, Core Animation and Quartz, and 3rd party libraries like Sparkle for auto-updating. Open Emu is based on a modular architecture, allowing for game-engine plugins, this means Open Emu can support a host of different emulation engines and back-ends while retaining a familiar OS X native front-end.

mGBA is a new Game Boy Advance emulator written in C.

Snes9x EX is an SNES/Super Famicom emulator written in C++ for Android, iOS, WebOS and Linux. It uses the emulation backend from Snes9x and is built on top of the Imagine engine.

The number one Game Boy Advance emulator for iOS is back, and has been rewritten from the ground up for iOS 7.

BGB is a GameBoy emulator/debugger which runs on Windows and Wine.

RetroX is an Android application that will help you organize and play your own Retro Games with the less possible effort. Put your collection in your device and RetroX will take care of the rest.

DroidEmu is a game system to play SNES, NES, GameBoy Advanced, GameBoy/Color, SEGA GameGear, SEGA Genesis games on your Android phone. It runs thousands of games at full speed.

nds4droid is a free, open source Nintendo DS emulator written for Android smartphones. It is based off of the excellent emulator DeSmuME. The source code can be found on sourceforge.