Thanks for the mention, wheaties. We're very proud of Foundation (http://foundation.zurb.com), and our team devotes countless hours to ensuring it's the best responsive front-end framework out there.

As others said, why not bootstrap?

Zurb is more flexible and less opinionated.

I've used Bootstrap and switched to Kube for a recent project. It's smaller and feels cleaner. Responsiveness feels tacked on in bootstrap rather than baked-in like Kube. Bootstrap is great for apps, but if you just need a good grid and some defaults for a content site, Kube is great.

Because bootstrap is totally overused, some differentiation would be nice.

I'd argue that Bootstrap the framework isn't overused, however default bootstrap theming is.

There's no argument. You are just correct. Saying Bootstrap is overused is like saying Wordpress is overused which does not matter. The fact is, as you said, the default look and feel of websites using these frameworks is overused, not the technology behind the websites. The backend should be overused.

Exactly. Something as simple as using different typography or changing button style defaults would go a long way.

I understand the idea of using something more minimal for just grid etc, but for me, it hasn't been enough of an issue to not use bootstrap.

I don't see this solving a problem that doesn't already have a (few) solutions. It is early and I will add this to my radar

For me, Bootstrap feels like overkill for a simple site. I use skeleton, but will give this a try.