These tools were built to solve problems I encountered when building themes for Theme Foundation. Feel free to use them on your own projects.
Cadence
Cadence is a CSS library to help achieve a consistent vertical rhythm. It uses Grunt to provide SASS support.
Cadence Check
Cadence Check is a WordPress plugin that detects the default line-height of the site and automatically displays a corresponding background grid. This allows the vertical rhythm of the site to be easily checked.