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Keenan is a great person to work with. My business partner and I hired him to help design a Wordpress beta page for a startup idea and he exceeded expectations and went well above what we were asking of him.
concise.css is a front-end framework that I started building in 2012 to help provide myself with baseline functionality for the various client websites that I was working on at the time. It has since become a wonderful open source project helping developers focus on building beautiful interfaces and not what grid system to use or how to handle color palettes and responsiveness.
Flexicution is a flexbox grid system that's agnostic in regards to your layout and breakpoints. You can use the semantic grid mixin to generate rows and columns for your layout and components, or you can generate responsive class names based on the breakpoints used in your project.