Reveal.js - A framework for easily creating beautiful presentations using HTML
MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.
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.
Typora - A minimal Markdown reading & writing app.
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.
Pine - A lightweight, modern macOS markdown editor written in Swift