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Yes, https://slides.com from the creator of Reveal.JS. It's insanely productive, you can just drag and drop things, 1-click for animations and ordering and has other features I never seen with any other presentation tool. I was able to create some of my presentations in 10-20 minutes!

I’ve been working on something like that for the past two years. It uses markdown, but extends it with a bit of syntax to set templates, layouts, and animations

https://hyperdeck.io/

I've been working on https://presentador.app/ for quite a while now. Still under development and but is usable to create a simple presentation and new features are coming soon! Thank you