Download Augur:

VST instrument with Vector Synthesis

Augur by Antti is an emulation of the Prophet VS by Sequential Circuits from 1986 -the worlds first Vector Synthesis synth. Augurs 4 oscillators each get their sound from one of the 96 different waveforms. In the vector matrix it is possible to determine how loud each oscillator will be and to draw a path for the sound to travel between the 4 oscillators -letting them morph into each other. Unfortunately the Augur VST plugin doesn't support the drawing of user defined waveforms, as the original Prophet VS features. But it's still a very cool free VST synth, capable of producing some very interesting sounds.