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.
authorSTREAM - authorSTREAM enables presenters to upload & share PowerPoint, Keynote & PDF presentations online; embed in blogs, convert to video and share on social networks.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
Present.me - Present.me - the video presentation platform. Share all your presentation content in one place. Slides, slides and audio, slides and video or just video. No software to install, all you need is your slides, a webcam and YOU!