authorSTREAM - authorSTREAM enables presenters to upload & share PowerPoint, Keynote & PDF presentations online; embed in blogs, convert to video and share on social networks.
DocDroid - DocDroid is a service for sharing document and slides.
Zentation - Affordable webinar software. Create online presentations with synchronized video and PowerPoint.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
VCASMO - VCASMO is a multimedia presentation solution for photo and video slide shows, business presentations, training, academic teaching, sales pitches, and seminars.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month