Deckset for Mac
Via Brett Terpstra’s ReCap - this looks like a great app for creating presentation that's trying something different than your typical Powerpoint/Keynote style build:
Concentrate on the content and simply write down your thoughts and Deckset turns them into awesome-looking slides.
Great looking default themes and writing/support for Markdown. Awesome.
Deckset is $19.99 in the Mac App Store
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