Well, here it is...

3DS Title Manager?

What you can do with it?

Extract 3DS and CIA files, as well as rebuilding them
Extract only the RomFS from 3DS, CIA or CXI files into a directory, and rebuilding the RomFS for HANS
[NEW] Build .CIA files from .3DSX files! (it also lets you make a custom banner from a png file and a wav file)

Play some music in the background, while it's doing everything :P (You can turn it off in the settings menu)

For now, you can only do the things listed above, however, if you want me to add something then please tell me!

How to use it?

Use the arrow keys (up and down) to move the cursor, and press enter to select an option.
Need help? Just ask me down bellow
To change background music, open the folder .data, then the folder bgm. Inside, just put your musics inside, and you will be able to change the music in the settings menu (must be an mp3 file) (if it's your first time using the tool, and the bgm folder has musics inside, then you will be asked if you want background music, and then you will be prompted to select a music)

What not to do?

Do not edit any files inside the .data folder! (With the exception of the bgm folder)
Do not move, delete or rename any files during any extraction or rebuilding process. (duh)
Do not edit anything inside the "3DS Title Manager.bat" file (unless you know what you are doing)!

Credits?

So, here is a (very outdated) preview:

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Download here: https://github.com/TheMachinumps/3DS-Title-Manager (Select the "Clone or download" option, then "Download ZIP")

WARNING: Musics may be a bit too loud! Please turn down the volume.

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