Apple Keynote - Apple Keynote or just Keynote is an advanced level presentation software application created as a part of the iWork productivity suite by Apple Inc.
Zeetings - Turn your presentations into interactive conversations
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Ludus - Limitless creativity for your slides.
ZapTheater - Presentation software to make your slideshow autoplay on the Internet, replacement for Powerpoint
Crowd Mics - Crowd Mics provides solutions to turn phones into microphones for live events to boost audience interaction.