
Subtractive (VA) Synth VST Plugin - Free Download
FreeAlpha3:

VST synth with modulation matrix
The FreeAlpha3 VST instrument plugin from LinPlug is a subtractive synth offering 2 oscillators (each split into 2 halves) with 30 different waveforms. The FreeAlpha3 VST plugin features an amplitude envelope, a filter section with several filters and a filter envelope, 1 LFO, portamento, chorus, and a modulation matrix with 7 slots. Included are 64 top quality factory presets.SuperWave P8:

Pad and Lead Synth
The P8 VST synth by SuperWave is the fattest sounding freeware VST synth you can get your hands on! The P8 virtual analogue plug-in features 2 oscillators with both Single, Dual, and a 7 Oscillator detune mode. Each oscillator is assigned to an amplitude envelope and a filter section with a filter envelope. P8 offers 2 LFOs, a small modulation matrix, 2 delays, and portamento. A VST synth perfect for great leads, pads, and strings! Available for Windows VST in 32 bit and 64 bit.Minimogue Luxus:

Minimoog VST synth
The Minimogue Luxus VST plugin by Richard Brooks and the Voltkitchen Group is a software emulation of the famous Minimoog -perhaps the most popular analog monosynth of all time! The VST plugin features 3 oscillators, 1 amplitude envelope, 1 filter envelope, 1 LFO, portamento, delay, chorus, overdrive, and an Arpeggiator with a 16-note Step Sequencer.Minimogue Luxus is an improvement of the previous MinimogueVA plugin with panning per oscillator and stereo non-linear filters. The sound of the Minimogue Luxus VST synth is great and at times very close to the original Minimoog!
EVOL:

Warm Virtual Analog Synth with FM
The EVOL VST plugin by Michael Kastrup (Synthtronic) is a free virtual analog synthesizer. The plugin features 3 VCO'swith FM, Ring Modulation & Waveshaping, 3 ADSR envelopes, 5 LFO's, Arpeggiator, Rhythmic Gate, and an effect section with Reverb, Chorus, and Delay. The free EVOL analog synth is made with Synthedit, but the sound has a very warm and analog feel (unless of course Ring Modulation or FM is being used). The EVOL VST comes with 127 very useful presets.