For a user's request we have implemented forex data support in Chartoasis Sesame.
Using Sesame for forex is not a bad idea: by using monthly statistics you can identify months for some currency pairs where the chance of going up is 3 times more than going down!
The source of forex data is Stooq.com. You can find a detailed guide on how to dowload data from Stooq here.
From today you can use monthly statistics, performance comparison and long term performance analysis for currency pairs, too.