We haven't thought that much about it actually. The only experience I have with it is that the whole web is filled with crappy spam sites that is using the content from Stack Overflow to earn a few extra bucks and that is kind of irritating.

Maybe someone has done something really useful with the data as well that i don't know about though.

But if someone have any awesome idea and want to do something together we are always listening :)

/Ola

Spam sites are definitely a legitimate concern.

I really love the idea of AlternativeTo, but unfortunately don't feel comfortable adding content unless my contributions will be under an open license. So I'm not sure what great stuff could be done with the data (though I bet there is something) but you might get more users if you go with a CC license.