About greed : Game of consumption!
More Information: http://www.catb.org/~esr/greed/
Steps:

1. Open your 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 greed

Done!