EmuNations

Azahar is an open-source 3DS emulator project based on Citra. It was created from the merging of PabloMK7's Citra fork and the Lime3DS project, both of which emerged shortly after Citra was taken down. The goal of this project is to be the de-facto platform for future development.

Forks

AzaharPlus 

• Support of 3DS files. If a file works with earlier Citra forks, it works with AzaharPlus.

• Ability to download system files from official servers. No need for an actual 3DS.

Citra is an open-source Nintendo 3DS emulator/debugger written in C++ which is currently able to run quite a few homebrew and commercial games, albeit very few can reach full speed on existing hardware and most titles have issues. There's also available as a libretro core. 

It does not natively run dumps of games that have not been decrypted properly (unless you have dumped your own system keys). This requires a physical 3DS and the game you own. Refer to:

• Dumping Game Cartridges

• Dumping Installed Titles

• AES Keys

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CITRA DEVELOPMENT has been HALTED due to Nintendo as such WORTHY ALTERNATIVES

• Borked3DS

• Mandarine

• Lime3DS

• Cytrus