3DS Hacks - Installing Games and Homebrew Apps - CFWaifu
3ds-cia-qr-code directory listing
3DS Simple CIA Converter - GameBrew
How to Decrypt .3ds Files into .Cia for Use on 3ds Hardware - YouTube
If you like JoJo's Bizarre Adventure, specifically part 3, and you have a New Nintendo 3DS, this will be useful for you. If you don't have a modded 3DS, you'll need to