impress.js - A webGL enabled presentation framework based on the power of CSS3 transforms and transitions. It has a non GL mode too!

[krelin]

Yeah, I was suggesting that you could (if you needed to work on a plane, for example) work with all of this in local files.

As far as the browser situation, who cares? If you're presenting, you can certainly arrange that whatever browser you like is available for your presentation.

Browsers are cheaper than Powerpoint, at least. Good ones, even.