Another good indicator from our archives that I couldn't find here yet, the T3 Trend Strength by Mladen for MT4.

As explained by Mladen:
Here is a T3 strength that with some changes

It allows up to 15 T3 averages to be calculated now (parameters are reorganized, but I think that it is easier this way to use it). Also, each and every T3 can have it's own shift. Because of that appearance of the indicator can change in cases when any of the calculated T3 averages has a negative shift. A problem with negative shift is that it addresses future prices and that at the end of data (meaning when it is near current prices) it lacks prices (they simply do not exist yet). So, if there is any negative shift in any T3 calculation it means that the "shift" period is going to be changed (recalculated, repainted whichever expression one prefers) when the price is in. For that reason indicator draws that period in gray color now indicating that that part of calculation is a subject of change

Here is an example in which 0 T3 shift is set to -25 (I used a big negative shift on one f the t3 shifts in order to make it clearly visible hat is happening in those cases): the last 25 bars are drawn in gray since as the new prices are formed, that part of indicator will be changed

PS: For positive shift there is no such an issue (since they always are using past prices).