iWantHue

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We used:
Sigma.js,Prettify,Bootstrap,jQuery,Modernizr,Initializr

Check our GitHub.

See also our other tools at Médialab Tools!

And a huge thanks to these inspiring works:

I massively use this excellent js library to convert colors. If you have not done it yet, look at this post. You'll understand much useful things about color in dataviz.

Very famous tool, that showed the way few years ago. If you do not know it, you must take a look.