Reveal.js - A framework for easily creating beautiful presentations using HTML
SlidesPPT - Beautiful free presentation templates for Google 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.
Slidebean - Presentations that design themselves
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.
Peetch - The last PowerPoint Pitchdeck you’ll ever need