Follow link to gridsetapp.com →
Gridset is a tool for making grids. It lets you create whatever type of grid you want: columnar, asymmetrical, ratio, compound, fixed, fluid, responsive and more. It serves multiple grids to your site based on breakpoints for different devices. I’m so excited for this app that I had to post it here. From Mark Boulton et al., what could go wrong? (which is the case with grid generators).