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ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files.

Dolphin is an emulator for running GameCube, Triforce and Wii games on Windows/Linux/OS X systems and recent Android devices.

Currently there are libretro implementations for systems such as SNES, NES, GBA, GB/GBC, Genesis, and even arcade games (Final Burn Alpha).

Android Game Boy Emulator written in Java.

This is the Android port of an NES emulator written in Go.