emacs-mac by Mitsuharu Yamamoto enhances vanilla GNU Emacs by enabling various Safari-like conveniences, such as tabs and tab overview and back/forward swiping between buffers. It also enables various Mac-specific Elisp commands, such as (mac-auto-operator-composition-mode)
to enable font ligatures.
You can install a pre-built binary with the Homebrew formula provided by railwaycat. But be aware that you can't launch it from Spotlight, because it doesn't install Emacs.app
in /Applications
(you'd have to do that manually).
brew install autoconf gnutls pkg-config texinfo