Free Expert Advisor (EA) Demos

Martingale Grid:
The Martingale grid places limit orders above and below the current market price whenever no open trades exist.  When you feel the markets are range-bound but the direction remains uncertain, you can stack orders of increasing size to recoup any losses that you may encounter.
When the market hits one of the orders’ take profit, the EA closes out all open trades.  It then restacks limit orders, just as it did in the original sequence.
Traders should exercise extreme caution when using this EA.  The trades do not place stops on their orders.  You should expect to manage large losses if the limit orders enter and the market moves too far away from you.

What is a Martingale?
Martingale, a term taken from gambling, relates to increasing risk after consecutive losses.  When a trader doubles his risk on the next trade, he can potentially recover not only the loss on the past trade, but also achieve the original amount of profit that he original desired.
You must consider the risk of a long string of losers compared to the amount of money in your account.  Martginale position sizing grows very large, very quickly.  As such, the risk of outsized losers increases along with it.

RSI Line Cross:
The RSI line cross works by overlaying 2 separate RSI periods.  A common example would be 9 period and 14 period lines.  Whenever the fast line (9 period) crosses above the slow line (14 period), it represents a bullish signal.  The fast crossing underneath the slow line creates a bearish signal.  The RSI is a ranging indicator.  Signals should perform well in range bound markets, while signals would be expected to generate losing trades during trends.

CCI Line Cross:
The CCI Line cross takes advantage of the indicator's extensive range by comparing a fast line against a slow line.  The idea is that the fast line crossing above a slower period signals a buying opportunity.  Downward crosses indicate sell trades.  The trending nature of the CCI indicator implies that it should perform better in a trending market.  Ranging conditions would likely lead to overtrading and negative performance.

Donchian Breakout:
The proprietor of the famous Turtle Traders developed this basic strategy.  When the price forms a new highest high, it goes long.  When it forms a new lower low, it goes short. 
The idea here is that certain instruments, especially GBP/JPY, tend to break hard in one direction.  New highs and lows often signal a new move.