Quote from zxcv1fu:
The only one I know is the HotTrend Radar of Real Tick:
http://www.realtick.com/support/hottrend/realtick_radar_help.html
Quote from plugger:
I'm looking for an intraday scan (real-time) which will display stocks trading unusual volume and price action for the beginning of the trading day (ie: first 30 minutes). Any suggestions for websites (free would be great). Thanks.