Clash of Ninja Modding
Guides
GNT4 Hacking Documentation - A primer on the files and filetypes used in Naruto: Gekitou Ninja Taisen! 4. Includes details on the manipulation of graphics, sound, characters, and more.
Tools
QuickBMS - An incredibly powerful tool used for unpacking and repacking several filetypes used in various games, including Eighting's FPK format (used in Naruto: Gekitou Ninja Taisen!, Bloody Roar Primal Fury, Tatsunoko vs. Capcom, etc.)
The GNT Hex Editor - This tool allows for the manipulation and insertion of text within both Naruto: Gekitou Ninja Taisen! 4 and Naruto Shippuden: Gekitou Ninja Taisen! Special.
BrawlBox - Originally used by modding communities to manipulate files in Super Smash Bros. Brawl and Mario Kart Wii, this multi-faceted tool is capable of viewing and manipulating some of the filetypes used in both the Gamecube and Wii Naruto: Clash of Ninja titles.