Slideshow IDE for programmers? Is there a slideshow editor similar to Powerpoint, but for Mac, that supports code pens and maybe markdown?

Thanks
I don't know if you would call it "similar" to PowerPoint as PowerPoint isn't focused on MarkDown or code, but a nice Mac app is "Deckset" 1.

Another option is to use the browser-based Remark 2. However it is not a native Mac app as such.