The hack was made with the following tools :

SMB3 Workshop, by Hukka
The best Smb3 level editor out there, very handly and efficient : if you want to create a Smb3 hack, you'll inevitably need this!

SMB3 Discombobulator, by Acmlm
This is another Smb3 editor, with less features though it still is better than SMB3W for editing map screens, and some other little things.

SMB3 TSA Editor, by DahrkDaiz
Well, as the title says, this one edits the Tiles Squaroid Assembler of SMB3 ; it has been VERY useful.

YY-Chr, by YY
A Tiles Editor for various system ; small, handy, efficient : perfect to edit all graphics from the game!

XVI32, by Christian Maas
An Hexadecimal Editor, used to edit some of the games' code and datas.

FCEUXD, by BBitmaster, Parasyte
The best NES-hacking tool ever made, based on the FCEUltra NES emulator, it adds a lots of new features such as an efficient Debugger, PPU viewer, Trace logger, a Code/Data logger and even a built-in Hex Editor! Simply the ultimate resource to hack nes games.
It seems that its original page is no longer available, but you can download it on Zophar.

Here is a non-exhaustive list of all the people who directly or indirectly helped me doing this hack (mainly by learning NES ASM hacking) :

Acmlm
BBitmaster
Chickenlump
Crispysix
DahrkDaiz
Disch
Gil_Galad
Hukka
Matrixz
Parasyte
Y0shi
Vystrix Nexoth

And thanks to all the people from Acmlm's Board who have always been supportive.

Hack made by JaSp, contact at Jaspile [.at.] hotmail [.dot.] com, or find me on Acmlm's board.