It's basically a powerpoint presentation. The slides are projected to the audience and you have a field for the presenter's notes. Any powerpoint style software should be able to do this.

In this particular case, there's a link at the bottom of the page, the guy used his own keynote-export tool to turn his Keynote presentation into a web page (Keynote is apple's powerpoint-like software):

https://github.com/mcfunley/better-keynote-export