frogmouth VS glow.nvim

Textual is not 3d too, but is also great for TUIs.

Textualize/Frogmouth has a TUI tree control: https://github.com/Textualize/frogmouth

FWICS browsh

No, since Vim uses a TUI and Markdown doesn't only display text. You could use something like Obsidian, which can display live previews of Markdown files side-by-side with the raw text and has support for a subset of Vim keybindings. Or use a terminal multiplexer like Tmux and open a split with a preview with something like Frogmouth (your preview will still be in a TUI but it would look nicer than the source file). Emacs might also have something that does what you are looking for (when combined with evil-mode if you want to preserve Vim keybindings) but I haven't looked into it.

Instead of latest release notes, https://github.com/Textualize/frogmouth would've been a better submission link imo.

Try this plugin called glow

Perhaps take a look at Glow.nvim?

Something like this might be interesting: But I guess you might be looking for something more integrated. https://github.com/ellisonleao/glow.nvim

https://github.com/ellisonleao/glow.nvim - A must for getting live in buffer previews

You want the preview in neovim itself and not in an external application? What kind of preview did you have in mind? Neovim typically runs in a terminal, and in the terminal, you typically can't have graphics or multiple fonts or other things advanced markdown would support. There are plugins that would preview with something like glow—see here. Not sure if that would met your needs.

i usually use https://github.com/ellisonleao/glow.nvim for quick in-terminal peeks, and https://github.com/iamcco/markdown-preview.nvim (browser and terminal side-by-side) if I need to refer while editing.

I don't know about brow.sh but you can do it with glow.nvim, which uses Glow