It's ironic, really. Developers can have a hard time getting funding for their Open Source work, while at the same time, the Open Source users may have a hard time fin ding developers. Even when they are willing to pay, some users simply don't know how to ask the Open Source community for help.
Developers register at the site and post ideas for projects they'd like to see funded.
If everything is up to snuff, the sponsor signs off on that milestone and the developer is paid directly by sourceXchange. Once the last milestone is reached, the project gets archived on the site where anyone is free to download the code. The developer and sponsor then rate each other for the benefit of future developers and sponsors. More than one developer can work on the same project, and multiple sponsors can jointly fund a project. And sponsors can get more than code from sourceXchange.