Did you ever want to change some attributes of your character , well here is how to do so. Right now it supports the editing of just about everything you'd want to edit, though there's still plenty of values in the file of whose purpose I'm unaware. See the TODO file for information on what needs to be done with the app still, which is quite a bit. The README file should be pretty informative as well. The app is released under the GNU GPL 2.0.
The apps were developed on Linux, and they use Python, GTK+, Cairo, and PyGTK to do its stuff. It works on Windows as well. I've had at least one report of somebody getting these packages to work on OS X; see the Installation page for some more information on that. (See the "related" section below for an app which is probably much easier to get running on OS X, but only lets you edit Book 1 character files.)
For me on ubuntu 11.04 i didn't need any thing to launch the python files it just run them and everything goes well and for windows it just need to install the runtime environment mentioned above