As I didn't had any single answer except the ones above, I'll start to drop some.
If anyone wants :
ESOUI : Is the extraction of the Lua source code of the game itself.
Good programming skills are needed in case of (in C / C++ / C#)
Knowledge of mercurial is a plus (or git, or svn).
It's a 20min work / week.
I'll give you rights.
I won't update it anymore since I need to drop few ones.