I will say though that Foundation is much easier to customize styles for than Bootstrap, which is one of the primary reasons we now use Bootstrap for internal apps or side projects which we don't intend to implement a custom design, but Foundation for all sites which we plan on designing.
Also, your statement is factually incorrect. There was a single commit in the past year. If you had said that next month, you might have been correct.
The author is on twitter...
For us, things like buttons required a ton of overriding with Bootstrap when we customized the button design, but Foundation didn't. We found this largely to be the case because Foundation makes less assumptions about how buttons are styled to begin with. For example, buttons are pretty basic with square corners. If you want rounded corners, you just add the "round" class. If you want buttons with a different radius, you just create your own new class with a specific border radius and add that. Different color? Create a new class with a background color and add that.
What in Foundation did you experience pain trying to override?
Step 1. Include bootstrap.js
Step 2. Don't include bootstrap.css
I think the OP is referring to all of those things, without the design styling - not the literal styling.
edit: I'll post this as an edit since there are multiple responses referring to http://www.getskeleton.com. Skeleton is similar to what I'm asking for but it seems to have stopped short. I would love to see unstyled carousels, alerts, modals, sticky headers, images with inline comments, etc. Basically, all the really nice stuff you get in Bootstrap and Foundation but without any of the styling.