Mueller is a modular grid system for responsive/adaptive, and even non–responsive layouts, based on Compass. With it, you have full control over column width, gutter width, baseline grid and media queries. Among its features it has:

– One default grid and (if needed) different per–media grids (e.g. large, tablet, handheld).

– Capability to extend your media–grids to pre–defined layouts (e.g. a 2-column layout with switched columns).

– Addition of fractional classes on top of grids and layouts (e.g. all-half, all-thirds, all-1of3).

– Templates addition instead of using presentational classes in your markup.