Chartmill is a very good free charting and scanning tools for active traders. It has a number of pre-designed scans to find a variety of trade ideas. You can also ask them to implement a custom scan for you.
Chartmill is a solid free screening site that offers tools not found elsewhere, such as the Mansfield RS and the PocketPivot. The scan feature allows a trader to scan visually which helps tremendously while doing your technical analysis homework. To top it off, the site's creators are hands-on and always available should a question arise.
Chartmill is an awesome stock screener. You can find perfect chart patterns in a moment and what's more ... it's free!