DocSlide - DocSlide is an online document and knowledge sharing platform.
VCASMO - VCASMO is a multimedia presentation solution for photo and video slide shows, business presentations, training, academic teaching, sales pitches, and seminars.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
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.
iSpring Cloud - Share PowerPoint online on any device. Perfectly preserve all advanced PPT effects, interactivity and embedded rich media in your presentation. Use it free!