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.
LibreOffice - Impress - Impress is a truly outstanding tool for creating effective multimedia presentations.
Reveal.js - A framework for easily creating beautiful presentations using HTML
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.
Sozi - Sozi
WPS Office - Would you need Office Word, Excel or PowerPoint for Home, business or School? WPS.com would give you right version for you.