Visual design Style tiles, mood boards https://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 https://susy.oddbird.net https://flexible.gs https://neat.bourbon.io Web apps https://gridsetapp.com