MUELLER is a modular grid system for responsive/adaptive and non–responsive layouts, based on Compass. You have full control over column width, gutter width, baseline grid and media–queries.
You mainly get the file grid_system, this is where the system is defined. All other parts (media, layouts, fractions, templates) are just examples of how to work with MUELLER. MUELLER is licensed under BSD.
Download Link: http://www.muellergridsystem.com/
License: BSD License