As far as I know, pure vanilla emacs from GNU comes with multiple vi emulations. I’ve been using viper for 20 years. It’s the only reason I use emacs at all. I had a co-worker many years ago who swore by emacs, but I found the key bindings completely counterintuitive having learned vi while getting my degree. Having made that discovery I was off to the races with emacs, and have never looked back.