A Nintendo 3DS Emulator, It's very simple and is only capable of running homebrews. It currently supports:



Folium is described as 'Beautifully designed, high performing multi-system emulator that allows you to play video games from retro consoles and handhelds, currently including cores for the Game Boy Advance, Nintendo 3DS and Nintendo DS' and is a Game Emulator in the gaming software category. There are more than 25 alternatives to Folium for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Folium alternative is RetroArch, which is both free and Open Source. Other great apps like Folium are Lemuroid, VisualBoyAdvance, Delta Emulator and Citra.
A Nintendo 3DS Emulator, It's very simple and is only capable of running homebrews. It currently supports:



iNDS is a derivation of the previous Nintendo DS apps for iOS, nds4ios and Nitrogen. The iNDS Team release of iNDS is a fork of the original iNDS emulator by William Cobb. iNDS Team aims to create a version that is driven by support from the community, adding trusted...
iDeaS is a plugin-based Game Boy Advance and Nintendo DS emulator for Microsoft Windows and Linux, using the GTK+ toolkit.




My Boy! is an emulator to run GameBoy Advance games on the broadest range of Android devices, from very low-end phones to modern tablets. It emulates nearly all aspects of the real hardware correctly.




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.



BoycottAdvance is a free and portable emulator for the Nintendo Gameboy Advance handheld. Program is available on Windows, Macintosh, BeOS, Linux, FreeBSD and there is even a Java port, playable online.




KiGB is the most accurate and free portable emulator for Gameboy, Gameboy Color and Super Gameboy for Windows, Linux and MS-DOS.




John GBA is the most popular Android Tablet alternative to Folium.
RetroFab is an online collection of 3D simulations of vintage electronic games that can be played in your browser.



Tanuki3DS is a cutting-edge high-level emulation (HLE) software designed to bring Nintendo 3DS gaming to your MacOS and Linux systems.
gpSPhone is a Nintendo Gameboy Advance emulator for the iPhone and iPod Touch. It has been ported by ZodTTD from the original source code of gpSP (made by Exophase). They are now both working together on this project.