jMax source code is available on SourceForge CVS.
You can checkout the jMax source via CVS on Sourceforge:
The following modules are available on CVS repository:
jmax: jMax sources
jmaxladspa: module containing source code to use LADSPA plugins in a jMax patch and to use a jMax patch as a LADSPA plugin
jmaxosc: module containing source code to use Open Sound Control in a jMax patch
jmaxsdif: module containing source code to read and write SDIF files in a jMax patch
jmaxtemplate: module containing a template for writing jMax external package
ftsxtra: module containing an Xtra to control jMax from Macromedia Director
jmax-nJam: module containing a jMax package for the distributed virtual concert, that provides audio streaming other RTP
jmax-vst: module containing source code to use a jMax patch as a VST plug-in
e.g, if you want to checkout jmaxladspa module:
To view all the modules, you can browse jMax cvs repository