Showdown for Mac

Showdown is an easy-to-use tool for quickly creating presentations using Markdown. It's perfect for those times where you need to whip up a presentation within minutes rather than hours, like for a sprint review or presenting your findings on that experiment for your team.

Just start typing Markdown in the editor and preview the resulting slides live. When you're done, just start the presentation. You can add speaker notes that are only visible to you during the presentation, and there are a few different themes to choose from.