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If bootstrap and foundation are too heavy for your liking, I prefer Skeleton. Responsive columns, rudimentary basic styling, and not much else.

http://www.getskeleton.com/

I used skeleton too for my latest small project. It's nice, but... very minimal

Started using it a few weeks ago. Loving it.

I don't want all the stuff that comes with bootstrap - I'm comfortable designing from scratch, I really just want a functioning groundwork for a responsive layout. Skeleton is perfect for that.

Fwiw it's easy to remove everything from Bootstrap you don't want, they modularize all that stuff into separate .js and .less files. Just clone the repo, find the concat, less, and uglify tasks in the Gruntfile, comment out the modules you don't want, then build it with 'grunt dist`. Simple, and you get a ready-made build system to use with your own project.

On the responsive performance side of things, I've been building a tool to help track build differences and load performance across different viewport widths. Demo for The Guardian here... http://speedcurve.com/demo/

I'd also recommend Froont: http://www.froont.com

If you just prefer a very lightweight grid system on top of Compass, maybe Susy is for you: http://susy.oddbird.net/

Currently I´am testing https://rukzuk.com/en/

Responsive design tools