Ludus - Limitless creativity for your slides.
authorSTREAM - authorSTREAM enables presenters to upload & share PowerPoint, Keynote & PDF presentations online; embed in blogs, convert to video and share on social networks.
SlideLizard - Powerpoint plug-in for live audience interaction
projeqt - With Projeqt, your presentations never remain static. Pull in live tweets or blog feeds, insert an interactive map, add audio notes or stream videos. Let your presentations be as dynamic as you are.
Zeetings - Turn your presentations into interactive conversations
Zentation - Affordable webinar software. Create online presentations with synchronized video and PowerPoint.