What are your favourite programming katas sites?

Photo courtesy of flickr user egilbokn

For those of you that do katas, what are your favourite katas sites? Here's some of mine for front-end development:

ℕ𝕚𝕔𝕜 𝕋𝕒𝕪𝕝𝕠𝕣

@nickytonline

Have you done your front-end katas today? es6katas.org, flexboxfroggy.com, #javascript #es6 #flexbox

03:32 AM - 01 Aug 2017

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Post katas sites for any programming that you do.