DislikedHard to tell, quite many systems work if rules are followed (FxPro, ForexSnipers etc), but they are not perfect. Good and helpful for beginners, later a trader probably moves on and finds his/her own indis and rules.
But if I have to name one - it's free system, CatFX50, Google it.Ignored
terminex if you want a good rundown of the CatFX system go to EA-Performance.