I use INSIGHT TRADER and am VERY happy with it.You can do scans...

I use INSIGHT TRADER and am VERY happy with it.
You can do scans based on all types of criteria and
indicators, as well as profit test a system against
previous data.
As someone said earlier, scanning for interesting stocks
is only the start, once I get a list of potential stocks based on my criteria, I pull up their charts in 2 time frames for closer analysis. "Black box" systems that tell you what and when to buy and sell are, IMHO, rubbish.