Keynote is described as 'Easily create gorgeous presentations with Keynote, featuring powerful yet easy-to-use tools and dazzling effects that will make you a very hard act to follow' and is a very popular Presentation Maker in the Office & Productivity category. There are more than 50 alternatives to Keynote for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and iPad. Most alternatives are Presentation and Slideshow Makers. The best alternative is LibreOffice - Impress, which is both free and Open Source. Other great apps like Keynote are Microsoft Powerpoint (Paid), Google Slides (Free), Prezi (Freemium) and Sozi (Free, Open Source).
Prezi allows anyone who can sketch an idea on a napkin to create and perform stunning non-linear presentations with relations, zooming into details, and adjusting to the time left without the need to skip slides.
Prezi vs Keynote opinions
Some users think Prezi is a great alternative to Keynote, some don't.
Apple Keynote is so much versatile, has tons of different animation, Prezi is almost all about zoom outs and ins, very limited...
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.