http://www.stockpi.com/
A multi-factoral analytical engine developed by Aditya Pabuwal that suggests both long and short positions in U.S. equities.
The Quadrix system, developed by Richard Moroney, allows for filtering from a universe of about 4,000 U.S. stocks and ADR's. A useful feature of the system is that it provides for input of variables by percentile rank rather than by raw values. See Overview of Quadrix sytem.