authorSTREAM - authorSTREAM enables presenters to upload & share PowerPoint, Keynote & PDF presentations online; embed in blogs, convert to video and share on social networks.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
PreZentit - Prezentit is an online presentation solution based on JavaScript that comes with new online collaboration tools.
Reveal.js - A framework for easily creating beautiful presentations using HTML
Sozi - Sozi
Zentation - Affordable webinar software. Create online presentations with synchronized video and PowerPoint.