https://codepen.io/andreasstorm/full/ClguF/
https://bttn.surge.sh/
http://codepen.io/Zaku/pen/ALChE
http://vincentgarreau.com/particles.js/
http://tholman.com/intense-images/
https://dixonandmoe.com/rellax/
https://web-animations.github.io/web-animations-demos/#spin/
http://btmills.github.io/geopattern/
https://tympanus.net/codrops/2016/03/02/creative-svg-letter-animations/
http://codepen.io/osublake/pen/pRNYRM
http://codepen.io/dudleystorey/pen/kkYawX
http://codepen.io/rkpasia/pen/LNEQod
https://kimmobrunfeldt.github.io/progressbar.js/
https://placehold.it/
http://cssreference.io/
http://flickity.metafizzy.co/
https://benhowdle89.github.io/grade/
http://codepen.io/vailjoy/pen/OWVwvO
http://wtfhtmlcss.com/
http://specro.github.io/Philter/