Parity Plus by USEC International
I have been using Parity since 1995. I started with the first version.
It is one of the best software I have bought for my money. I bought the latest version 2.1 for a year ago. I think that the scanning and filtering features are just great. Since the software doesn't seem to have a lot of overhead graphic, it is fast. The 3 dimentional algoritms makes it possible to scan all your stocks with one set of indicators or scan one security with several sets of indicators.
I agree with the previous review in all but one: I talked to Customer Service at USEC International and they said that the Shareware version should not be available in the market since 1997 and version 1.5 (among other changes)is not Y2K compatible.