Ferox is a free tape saturation modeller VST plugin.
Moppeltron employs the Discrete-Summation Formulae synthesis technique proposed.
Resound is a software audio delay effect processor that emulates the sound.
It can send MIDI clock and a CC on a start/stop to the VST midi out.
Standard Tuning and Sub Phase Distortion Oscillators.
Organux is a virtual organ VST plug-in that covers a wide range of sounds.