Indicators are generally free and others are even pre installed in IBX platform. Some of these are Heiken Ashi Smoothed, MACD with a EMA ( comes stock in MT4) TradersDynamicIndex(TDI) and lastly QQE. Although one of my favorites it RENKO. The problem with it is not coded for MT$ but for NT only.
I found a vendor selling it for 500$, I just had a laugh since they are generally free. Thr pointer arrow is a MA crossing and Gann HiLo activator arrow. The subwindow Green and Red is an old version of SEFC indicator and it repaints. That means, this is not good for newbies.
SEFC indis is another of my favorite. The polychromatic momentum indicator looks great. And it does not repaint after the bar closes. You also need a dll when downloading this one.