As well as the shiny interface, what makes Google is oodles of current, hi-res imagery and enough grunt to make the same base set of data available to a large chunk of the world's population.
Taken as a complete product, I can't see anything remotely in the ballpark. FOSS can do software, but data and servers to cough it up is not a software issue. Bing has data, but from what I've seen their data currecny and resolution is trailing Google. Due to the economies of scale involved, catching up would probably need deep pockets.
Xix.