I like to have some control to the chaos of installing different packages and libraries on my Macbook Pro. These are the files I use to keep things in order.
I use homebrew to manage various casks and software I need.
Within the directory where the Brewfile resides, run the following command
brew bundle install
To manage my Gem dependencies I use RVM which is typical. However, having a Gemfile to replicate my Gems across development machines is a nice thing to have :)
Within the directory where the Gemfile resides, run the following command
bundler install
For more Bundler info