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VSTLord
a VST test host for Mac OS X. -
MultiDelay
a VST and AudioUnit delay plugin for Mac OS X (only ppc, no universal binary) - code snippets
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VSTGUI library
a cross platform C++ library mainly for developing user interfaces for audio plug-ins (VST, AudioUnit, RTAS, etc). -
VSTKit
Cocoa framework for hosting VST3 plug-ins