We have looked for best free forex trading signals service and found these two:
1) Zulutrade
Zulutrade is a free service where you can auto follow best forex traders and auto copy their signals.
You can choose your favourite broker and then simply go to Zulutrade performance page to see best forex traders, pick some of them and add them to your portfolio.
2) ForexCopy
This system is provided by best forex broker in Asia: InstaForex.
You simply open a trading account and then go to ForexCopy monitoring and choose traders you like, add them to your portfolio and receive their free forex trading signals on your trading account.