Supertrendline indicator with alert is here.
Please note that this indicator is using SuperTrend indicator. So download this indicator from here (or just re-name Supertrend onto SuperTrend but may be the same one).
See this link https://www.mql5.com/en/forum/174336
MACD with alert https://www.mql5.com/en/forum
BBands_Stop_v1 with alert is here:
NonLagMA_v6 indicator with sound alert is here https://www.mql5.com/en/forum/general
Just to remind:
Heiken Ashi for separate window with sound alert modified by Igorad.
StepMA_v7.2 with alert https://www.mql5.com/en/forum/173044/page6
Price levels alert indicator thread is here https://www.mql5.com/en/forum/175960
This problem was solved already.
Read this post https://www.mql5.com/en/forum/175733/page2
juice levels alert fixed is here.