Interesting new app by the makers of smartdown (Neomobili), which is a pleasant markdown app (alas, Mac only) with folding capabilities (you can fold headings, and it treats subheadings as lower levels in the hierarchy).

They've come up with a rather neat Markdown-based presentation creator. It's very elegant, and they've thought up some clever ways of inserting diagrams easily. Although it's being sold through the Mac App Store, there's a trial version available from their website.

More info and trial at: www.neomobili.com/products/slidium-markdown-presentation/