GTG MS 2008 is a free VST Analog Synth Instrument. Classic analog synth. Logical layout. Modulation Envelope. Chorus and Delay. Sub Oscillator. Fast envelopes.
GTG K1 VSTi is a free remake of the K1 synth. With some minor enhancements.
GTG FM 4 is a free FM synth VST instrument plugin with a different structure.
GTG JP 7A is a free analog synth vst instrument.