How do I access the pure-data source code repositories?
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Pd-vanilla is developed using a GIT repository on Sourceforge.
For the Pd community in general, there is the pure-data Subversion (SVN) repository hosted on Sourceforge which includes most of the externals,... development in Pd-world.
There are a number of other related source code repositories, you can get more information on those here: GettingPdSource