The WD Gann Box Indicator is a useful and popular free Forex indicator for MT4. This indicator can be used to identify trends, support and resistance levels, and reversals. It displays a box of the current price action on the chart and provides a visual representation of the trend. The WD Gann Box Indicator is a popular and free Forex indicator for MT4 that can be used to identify trends, support and resistance levels, and reversals.