I use R with Vim. Usually the R script file is open on top and there is a :terminal buffer with R running below. And I use a small vim-plugin [1] for sending commands from the editor to the REPL.

This has a few advantages, major being that you can run any language with a dynamic REPL this way, without changing your setup. Or, you can even have two files, written in two different languages, open side by side with a corresponding REPLs running beneath each of them. The downside of course is that you miss on auto-completion and other integrations like that. These are not impossible, but you would have to torture your Vim setup quite a bit in order to implement them.

[1]: https://github.com/karoliskoncevicius/vim-sendtowindow

Guessing here: probably Jupyter notebooks, Emacs and vscode, and perhaps the (very minimal) R IDE (if we can call it that) that comes with the installation of base R.

I use R directly from the terminal quite a bit for any small jobs, like calculations, purely due to the <1000ms boot time.

nvim-R for me. opens up a terminal and allows me to send code across from my scripts.