I’m a huge fan of Codepen.io
For me its a great place to browse, the digital equivalent of a coffee table book.
I’m sure at least two-thirds of my pens are forked, some with minor changes others unrecognisable.
I love the work of Karim Maaloul and his work with three.js and I just slightly adapted his Chill the Lion to create the Otis and Kiki Birthday animation.
My pens can be found here.