Responsable is a full-blown responsive framework for HTML, CSS, LESS and SCSS.
The framework has a clean markup and has its code normalized for consistency across browsers.
Besides that, it has the following features:
- Nested columns;
- Baseline grid for improved typography;
- Responsive images;
- Base styles;
All in all, Responsable looks like a good enough responsive design framework — I wouldn’t know, however, which one to pick from the plethora out there.