Ludus - Limitless creativity for your slides.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
SlideLizard - Powerpoint plug-in for live audience interaction
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.
Zeetings - Turn your presentations into interactive conversations
Issuu - Issuu is the leading digital publishing platform delivering exceptional reading experiences of magazines, catalogs, and newspapers.