iWork - Keynote
Commercial
Keynote for Mac, iOS, and iCloud lets you make dazzling presentations.
Reveal.js
Open Source
Reveal.js is a framework for easily creating beautiful presentations using HTML.
Google Drive - Slides is to create, edit, and collaborate with others on presentations.
Compare Prezi with alternatives
Compare iWork - Keynote and Prezi and decide which is most suitable for you.
Compare Google Drive - Slides and Prezi and decide which is most suitable for you.