Atomic Gold is a free software synthesizer developed by Fractal Breed. Available format(s): VST for Windows.
Atomic Gold is a 4 oscillator, 8 LFO, bi-filtered, 3 ADSR, phase-distorted synth with variable feedback unit, tweakable velocity sends and aftertouch control. Its many functions make it a powerful device to synthesize anything from heavy basses to organs and lush synths to deep LFO effects.
http://www.somethingfruitful.com/atomicgoldbeta/