This site is a collection of free Forex Trading Systems, Expert Advisors and back testing results.
Remember, there is no holy grail. Markets change. Some systems are designed to work in trending markets, while others are designed to work in ranging markets. Pick and choose your systems depending on the market sentiment. Review your systems every few months, and make adjustments as necessary. Many systems work, but they don't work all the time. Choose wisely.
Good luck with all your future trades.