I will keep updating this list as I find more tools http://css3generator.com/ here you can generate css for  columns , transisitions etc   http://css-tricks.com/almanac/ great list of often forgotten css selectors and properties   http://blog.gfk.com/2014/05/2014-mobile-ux-design-trends-embracing-minimal/ This one isn’t a css tool but a worthwhile article on mobile design which css is a big part of

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