MOOG was written by Chris Sneden and has -- and continues to be -- an invaluable contribution to modern stellar astrophysics. From the MOOG website:

MOOG is a code that performs a variety of LTE line analysis and spectrum synthesis tasks. The typical use of MOOG is to assist in the determination of the chemical composition of a star.

The current MOOG version hosted by this repository is the February, 2013 version.

Classically, MOOG has been difficult to install. Or at least, it has been for me because I'm bad at computers. Now it's easy-ier!

If you are on a Mac then you will need to ensure you have Xcode installed as well as the Command Line Tools first. Regardless of your operating system, you will need either gfortran (recommended) or g77 to compile MOOG. If you have either of these, just open a terminal and type:

sudo pip install moog (or sudo easy_install moog, if you must)

And that's it. Happy spectroscopy-ing!

The installer will compile MOOG and MOOGSILENT and place them in your $PATH. It will also install the required AquaTerm framework to /Library/Frameworks/AquaTerm.framework/, and create a ~/.moog directory to contain data files.

Note: If you're on Mavericks (OS X 10.9) then SuperMongo -- and subsequently MOOG -- can be notoriously difficult to install. Consider whether you need plotting functionality or not.

If you don't need the plotting functionality in MOOG then you can install just the batch version of MOOG, known as MOOGSILENT:

pip install moogsilent (or easy_install moogsilent, if you must)

If you're on OS X, you still need to ensure you have Xcode installed as well as the Command Line Tools first. Regardless of your operating system, you will need either gfortran (recommended) or g77 to compile MOOG. However you do not need to be sudo in order to install MOOGSILENT. The source code for the MOOGSILENT installer is kept in parallel on the batch branch.

Just type the following files to uninstall MOOG:

sudo pip uninstall moog (or pip uninstall moogsilent)

And to clean up completely:

sudo rm -Rf ~/.moog /Library/Frameworks/AquaTerm.framework/