You can do that with QuantShare. You can create your own studies including automatic supports and resistances and tell QuantShare to alert you when the price breaks the lines (or enters into a drawn rectangle, ellipse...) in real time.
Like any sentiment indicator, there are several ways to trade this.
But I am going to post only ideas and techniques here. I am not going to explain how to trade each one.
I started this thread to share with you some trading system ideas.
My first technique would be to use intercorrelation between sector ETFs to create a sentiment indicator to predict movement of the S&P 500.
Market Sector Correlations as Sentiment Measure - Seeking Alpha
The idea is to take...