DocDroid - DocDroid is a service for sharing document and slides.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Google Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
DocSlide - DocSlide is an online document and knowledge sharing platform.
Keynote - Keynote for Mac, iOS, and iCloud lets you make dazzling presentations. Anyone can collaborate — even on a PC. And it’s compatible with Apple Pencil.