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gnab/remark: A simple, in-browser, markdown-driven slideshow tool.
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FormidableLabs/spectacle: ReactJS based Presentation Library
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deckjs/deck: Deck is a markdown driven content presentation system
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Slides.com: Online UI for creating RevealJS decks (no markdown support yet, but maybe someday)
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Platon.io: Simple markdown presentations, right in the browser, using remarkjs
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Swipe: Create Interactive Online Presentations On Any Device
iA Presenter has an opinionated take on the markdown → slides workflow.
It recently hit 1.0. Note that it's Mac only, commercial, and apparently not (yet) scriptable from the CLI.