A good reason for using a non-linear tool such as this, is that you're able to layout your points (slides) on an infinite canvas, and make use of that specific

A good reason for using a non-linear tool such as this, is that you're able to layout your points (slides) on an infinite canvas, and make use of that specific layout to better explain how each point fits into the whole structure. For example, I've used impress.js to fan out from a central idea along different lines of work, each line being punctuated with different slides. The cool thing is, you can make a virtual overview slide that shows the whole clickable canvas. I've also used the layout to embed images resulting from intermediate algorithm stages directly inside those stages in the diagram. Besides that, and the flashiness which is definitely nice to have, your presentations are in an open format that's not locked to a specific vendor. (this is coming from someone with more than 10 years of academic presentations in powerpoint, which I now have trouble re-using due to almost 100% Linux everywhere. LibreOffice Impress 4.1 can display them, but much is lost in the conversion :)