VCV has released Host, allowing VST plugins to be loaded inside a VCV Rack module.
Host allows up to 16 VST automation parameters and MIDI controls to be modulated with CV in Rack. Instrument VST plugins can be played with monophonic CV/gate inputs, and effect VST plugins can process stereo audio from the modular world.
Currently 64-bit VST 2.x instrument and effect plugins are supported on Mac/Windows/Linux.
Price: $30.