(not the best one, but just some thought)

a website that allow FOSS community to pay up developers based on community request. basic goal : to speed up FOSS development.

i.e: let just say that user A want to donate $100 to pay any developer to create a 3D driver for X card. Later, user B want it to and increase the pot $150, and so on, and so on. At some time, some developers take a request and developing it, publish it and take the money. As a profit, 5% of the pot will be taken by the website.

So this website basically functioned as a mediator between FOSS user and FOSS developer.