MattWidz's FIFA 12 Mod Tools
At the moment it just has a career mode and an advanced career mode editor - I will be working of other editors soon!
Career Mode Editor
Simply load your Career File (Not the extracted file) and click Mod File to instantly give yourself £1,500,000,000 Transfer Budget and £10,000,000 Wage Budget - If you spend it all just simply do it again for endless amounts of credits!
Career Mode Advanced Editor
If you don't want £1.5 Billion Transfer Budget, this allows you to transfer the budget from one Career Mode save to another Career Mode File of your choice!
Just a quick copy & paste from Se7ensins, Enjoy ;)