DSK Music has released DSK Chaos Theory which is described as a "Random Synth".

Features:

• 2 Oscillators.
• LFO.
• Multimode Filter.
• Chorus effect.
• Chaos button (random preset generator).
• Velocity response.
• Preset manager (+30 built in presets).

DSK Chaos Theory is available for Windows as a VST instrument and it is free.