Visual design Style tiles, mood boards http://styletil.es/ Style Tiles and How They Work, Samantha Warren (alistapart.com) Collaborative Moodboards, Mark Boulton (markboulton.co.uk) Grids Frameworks https://github.com/at-import/Singularity http://susy.oddbird.net http://flexible.gs http://neat.bourbon.io Web apps https://gridsetapp.com