Helps you lookup what shell commands mean using http://explainshell.com.
Your OS X installation should have PHP 5.3.3 or newer installed. Lion or Mountain Lion should meet the minimum requirements. If not, you can install the latest version of PHP with MacPorts or Homebrew.
Download! Requires Alfred 2 and the Powerpack. Updates can be found and installed using Monkey Patch, or the older Alleyoop (discontinued).