Paul from mda-vst@smartelectronix has released the source code of his VST plug-ins.
Paul writes:
As I don’t have time to maintain or develop the “mda” freeware plug-ins any more, but I don’t want them to die when 32-bit VST 2.x plug-ins are finally obsolete, I have released the source code.
mda-vst has released many freeware plug-ins over the years, including the mda JX-10, DX-10, Piano and ePiano instruments and a host of effect plug-ins for Windows and Mac.
The source code is are licensed under a MIT/GNU license and can be downloaded from SourceForge.
Visit the mda-vst site for more information on the individual plug-ins.