This one in particular uses the jQuery onepage-scroll plugin [0] for the scrolling effects, prism.js [1] for code syntax highlighting and some plain HTML and CSS. Here's the complete code: https://github.com/emisfera/Splitchar.js/tree/gh-pages.

In reference to some other comments on this thread, this isn't built using Jekyll. GitHub pages supports pure static sites and Jekyll-powered sites if you put either on the gh-pages branch of the repository.

[0] https://github.com/peachananr/onepage-scroll [1] http://prismjs.com/