If you are searching for an emulator to run Nintendo or GBA games, it is possible to download it legally. OpenEmu is an all in one emulator for the Mac and can many run game consoles including NES, SNES, N64, Game Boy Advance, Nintendo DS, Sega Genesis, and many. It can run on several PC operating systems (Windows, macOS, Linux), home consoles (PlayStation 3, Xbox 360, Wii U, etc.), handheld consoles (PlayStation Vita, Nintendo 3DS, etc.), on smartphones (Android, iOS, etc.), single-board computers (Raspberry Pi, ODROID, etc.) and even on web browsers by using the Emscripten compiler. Works with Windows, Mac, Linux and Android. RetroArch has been ported to many platforms. RetroArch runs programs converted into dynamic libraries called libretro cores, using several user interfaces such as command-line interface, a few graphical user interfaces (GUI) optimized for gamepads (the most famous one being called XMB, a clone of Sony's XMB), several input, audio and video drivers, plus other sophisticated features like dynamic rate control, audio filters, multi-pass shaders, netplay, gameplay rewinding, cheats, etc. It is the reference implementation of the libretro API, It is licensed under the GNU GPLv3. RetroArch is a free, open-source and cross-platform front-end for emulators, game engines, video games, media players and other applications.

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