avecdo is the webshop-tool project I work on every day at my job. It just went open beta today, and is now live and ready for you to sign up!
avecdo is best described like this:
Connect your shop with services such as Google Shopping, Pricerunner and Facebook, without spending hours on programming and customization!
avecdo analyzes your product feed and transforms it into new feeds that are readable by the services of your choice.
As a result, you can easily streamline the flow of information between your e-commerce solution and other popular shopping sites.