Looks like a nicely done little system, by José Luis Antúnez for creating presentation slides.
WebSlides makes HTML presentations easy. Just the essentials and using lovely CSS.
An alternative to reveal.js. I like how it utilizes other open source projects.
I always feel like I should be using things like this for my presentations, as someone who normally very much likes working in HTML and CSS. But for some reason, I always reach for Keynote or Slides.com. I think it's a brain-modes thing. When I'm in "I need to work on what I'm going to say at this presentation" brain-mode, I don't want to be messing with markup, I just want to write and maybe pluck at some UI controls.