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I like this, but I'm still waiting for something that has this kind of live preview but also has a folder/file project sidebar like Ulysses 3.

LightPaper (free, not open source) has a project sidebar: http://cl.ly/WGSv

First I'm ever seeing this. This looks awesome, thank you. I also love Texts: http://texts.io/

I also like LightPaper, but it using file tabs at the same time as the project pane is kind of weird.