Borg is a bare-bones package manager for Emacs packages. It provides only a few essential features, and should be combined with other tools such as magit, epkg, and auto-compile.
Borg assimilates packages into the ~/.config/emacs (or ~~/.emacs.d~)
repository as Git submodules. An assimilated package is called a
drone. It is possible to clone a package, without immediately also
assimilating it, allowing you to review it, before performing that
second step.
Borg can be used by itself or alongside package.
For more information see the announcement and the manual.