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Auctomatic, a Y Combinator company, offers an auction and marketplace management system for all of those individual sellers on such sites as Ebay, Amazon, Overstock and others. The application lets you list your items as well as manage your sales, but it also helps you understand how to best optimize your selling and maximize profits. The company also received an investment from Paul Buchheit, the lead developer of Gmail.

Popcuts is a unique online music store. DRM-free songs are sold for 99cents, but every time a song you bought sells, you get a cut of the proceeds (earlier buyers get a bigger cut).