Scorpius is a free 3 Oscillator analog Polysynth instrument.
Orion 1 is a free VST 2 oscillator analog poly synthesizer instrument.
Damatriks is a free “classic” modular synthesizer system VST instrument plugin, inspired by the modular analog synths. With many different modules in place, endless creativity is guaranteed. These modules can be patched using a CV (control voltage) matrix module, creating complex CV patches.