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You have not specified the website; however, if you are referring to tinitusmed.com, it is built with OptimizePress
I was referring to the OP. If he has a specific website. In terms of software though my site uses Premium Press add-on with the iCodes importer. This automatically imports all codes and deals into your website.
My website is http://giveawayuk.com At the moment it's basic setup. The theme is highly customisable though. AS for iCodes I'm not sure on the best ever website but they are a major player in coupon and discount code database providers.