Freeware Virtual Putney Synthesizer

Ninecows has released the Putney v2.0 (.zip download link), a freeware architectural replica (SynthEdit) of the EMS Putney. The plug-in runs as a VST effect, not a VST instrument.
Description:
“As the original it is constructed of basic modules connected in a matrix, letting you route sources and control voltages to different destinations. Many module based synths can do that, but the Putney has one remarkable difference: There is no clear distinction between audio and control voltages as sources. For instance; you can let the output of one audio oscillator control the frequence of another, or use the noise generator to control the filters cut-off frequency.
Even though the synth (just as the original) is monophonic, the flexible routing system will let you create a huge variety of different sounds and effects.