Open Source Address Scrubber?

Question

I have set of names and addresses that have been entered into and excel spreadsheet, but the problem is that the many people that entered the addresses entered them in many

Answer 1

We use Accuzip. It's a lot cheaper than most solutions (~$700/year) and comes with bi-monthly updates. It uses the USPS address standardization API, for which I've written a .NET wrapper. This allows me to run it in real-time (Accuzip, by default, comes only with a batch mode).