[w0m]

NeoVim w/ render-markdown.nvim

(not to poo on OP - I dig a clean TUI renderer, I have BAT installed for a reason)

[Blackarea]

Bat is nice. Oh dang now i have to try this plugin. I remember trying a couple of similar ones that got me so frustrated that i abandoned the idea of markdown viewers in nvim... Here we go again XD

[chrysoprace]

render-markdown.nvim is very nice and works with GitHub Flavoured Markdown, even down to some of the newer features like INFO, IMPORTANT, etc. quotes.