About git-plus : Git utilities: git multi, git relation, git old-branches, git recent!
More Information: https://github.com/tkrajina/git-plus
Steps:

1. Open Terminal by pressing command+space, type terminal and hit Enter key.
2. Run

   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

3. Install

   brew install git-plus

Done!

More about git-plus:

Git plus is a set of git utilities:

• git multi execute a single git command on multiple git repositories
• git relation show a relation between two branches/commits/tags
• git old-branches find old/unused branches
• git recent list branches ordered by last commit time