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The only tool that I have a personal experience with, is ProspectFinder from Enecto, Sweden. You can check it out here: http://www.enecto.com/products/prospectfinder/ It compares IP adresses with local business information, and they can integrate it with your CRM (SugarCRM, SalesForce etc.). You can get an automated email with a new list of prospects each week and a bunch of other stuff.