On: Prezi - The Zooming Presentation Editor

[moondowner]

Sozi is a decent alternative http://sozi.baierouge.fr/wiki/doku.php

It can be used as a plugin for Inskscape, and the presentations created with it can be viewed from any modern browser.

Here's a quick tutorial: http://sozi.baierouge.fr/wiki/en:tutorial

And the result presentation from that tutorial: http://sozi.baierouge.fr/wiki/_media/tutorial-complete.svg (use space for next 'slide')