SlideShare is described as 'is the best way to share presentations, documents and professional videos' and is a popular website in the Office & Productivity category. There are more than 25 alternatives to SlideShare, not only websites but also apps for a variety of platforms, including Windows, iPad, iPhone and Mac. The best alternative is Scribd. It's not free, so if you're looking for a free alternative, you could try Issuu or Adobe Spark Video. Other great sites and apps similar to SlideShare are Microsoft Office Sway (Free), Adobe Spark Page (Freemium), Active Textbook (Freemium) and emaze (Freemium).
Adobe Spark Video, formerly known as Adobe Voice, now part of the Adobe Creative Cloud Express suite, helps anyone create stunning animated videos in minutes. No filming required — just record your voice in short increments to tell your story.
SlideOnline lets upload and share PowerPoint and PDF presentations online making easier to embed the presentations in websites, blogs and social networks. Currently it supports Adobe PDF and PowerPoint (.ppt, pptx) presentation format.
Millions of readers find and share the magazines, catalogs and publications they love on issuhub. It allows users to easily convert static PDF documents to digital publishions with realistic page-turning effect.
The Focusky zooming presentation tool is a creative online presentation maker for Windows & Mac, presenting your multimedia presentation in dynamic and engaging way with zoom and slide effect. It is a better presentation ideas rather than PowerPoint alternative.