Water
livecoding.io
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
I was blown away by his 'live coding' idea, but couldn't find any actual live examples, so I put together a quick demo using d3 and Ace. I 100% totally based it on Bret's idea - down to the clever book styling. Imitation is the sincerest... etc etc.