Bourbon Neat is an open source fluid grid framework built on top of Bourbon with the aim of being easy enough to use out of the box and flexible enough to customize down the road. It is built on top of Sass and Bourbon using em units and golden ratios.

Using Sass 3.2 block mixins, Neat makes it extremely easy to build responsive layouts. Using the breakpoint() mixin, you can change the number of columns in the grid for each media query and even store these values in project-wide variables to DRY up your code. It has been tested on Firefox 3.5+, Safari 4.0+, Chrome 4.0+, Opera 9.5+ and IE 8+.

Requirements: Sass and Bourbon Framework
Demo: http://thoughtbot.com/neat/
License: MIT License