There are a few IMHO: magit [1] is a nice piece for Git. And there's vterm, if you wish to use a (usable) term or tmux/screen without leaving the editor, tramp mode [2] for remote files and last but not least ergoemacs [3] if you prefer the CUA style for generic commands (and reduce RSI). Oh, and forgot to mention helm [4] too...

[1] https://magit.vc

[2] https://www.emacswiki.org/emacs/TrampMode

[3] https://ergoemacs.github.io/

[4] https://github.com/emacs-helm/helm