authorSTREAM - authorSTREAM enables presenters to upload & share PowerPoint, Keynote & PDF presentations online; embed in blogs, convert to video and share on social networks.
DocSlide - DocSlide is an online document and knowledge sharing platform.
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.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Zentation - Affordable webinar software. Create online presentations with synchronized video and PowerPoint.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month