Marketplace to sell ownership of our software?

I, with a partner, developed a Windows application that we would like to sell to a new owner. It's an application for the entertainment industry, and the third partner with all the contacts industry experience has in short not realized his contribution. There is no revenue, just a few hundred hours of development time to save the new owner on a similar project. Is there a marketplace like Flippa for software like this? Or, is there another common way to handle this?