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.
SlideOnline - Share PPT presentations online easily with a free PowerPoint presentation sharing platform
PreZentit - Prezentit is an online presentation solution based on JavaScript that comes with new online collaboration tools.