Paper Mario does not have very many hacking tools yet with only two being fully developed.

Mario Mache

A tool made by skelux. Originally titled Origami 64 and later renamed Kirigami 64 is a tool to edit battle formations text and more.

The tool can be dowloaded here.

Hack Rod

A very interesting tool. It's quite similar to Mario Mache, but has some advanced features like having the power to edit store items.

The tool can be dowloaded here.

Star Rod

An in development and advanced tool named Star Rod.
To get more information about this upcoming tool you can check Clover's Youtube channel