relax's source code is kept within a version control system called git. This system allows for fine control over the development of the program. The repository contains all information about every change ever made to the program. To learn more about the system, the git Reference Manual is a good place to start. The contents of the relax repository can be viewed online at https://sourceforge.net/p/nmr-relax/code/ci/master/tree/. The current sources can be downloaded using the git protocol by typing
$ git clone git://git.code.sf.net/p/nmr-relax/code relax
In addition there is a git repository for the relax website and a git repository for the relax demonstration files.