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Web tool that tells you how well colour combinations work, with simulations of various forms of partial vision. (It has the usual limitation that is your site uses translucent backgrounds or ink you need to screen shot it and find the effective colours via your favourite graphics editor’s eye dropper.)
(Via @aneventapart on Twitter)
Pantone have designated Classic Blue the colour of the year 2020.
A tool for experimenting with the proposed CSS color-mod functions. I find it useful even without browser support: I enter a CSS colour, fiddle with knobs like alpha and lightness, and see the resulting colour in CSS format I can copy in to a stylesheet.