One of my personal favorites was the FRAMA Ribbon coded by Mladen for MT4 which comes with (newer drop down box) Multi-timeframe mode + Interpolation & Alerts
I've searched high and wide for this one on our forum but had no luck (unless it's named differently somewhere) so I'll post it here.
The FRAMA (Fractal Adaptive Moving Average) is an adaptive moving average that was developed by John Ehlers and attempts to follow significant price moves closely while remaining "flat" during consolidation and price ranges.
An advantage of the FRAMA is that it takes into account that markets are fractal and the FRAMA will dynamically adjust the lookback period based on this fractal geometry.
In short, it's a solid trend-trading indicator which helps analysts filter out consolidation periods and encourages traders to enter during trending markets.