Surge

Title link takes you there. Check out each demo at the bottom of the page. This one sounds really good. Via Moogulator.

Specifications (v1.1.0):

General
Synthesis method: Subtractive hybrid
Each patch contain two 'scenes' which are seperate instances of the enitre synthesis engine (except effects) that can be used for layering or split patches.
Category based patch-browser that is fast to use
Future proof, comes as both a 32 & 64-bit VST plugin

Factory sounds
681 patches
157 wavetables

Oscillators
3 oscillators/voice
5 versatile oscillator algorithms: Classic, Sinus, Wavetable, S/H Noise and Audio-input
The classic oscillator is a morphable pulse/saw/dualsaw oscillator with a sub-oscillator and self-sync.
Most algorithms (all except sinus and audio-input) offer up to 16-voice unison at the oscillator level.
Oscillator FM/ringmodulation
All oscillator algorithms are band-limited yet they still cover the entire audible spectrum.
Noise generator with variable spectrum

Filterblock
Two filter-units with arrangeable in 7 different configurations
Feedback loop
Available filter-algorithms: LP12, LP24, LP24L (ladder filter with 1-4 poles), HP12, HP24, BP, Notch, Comb (4 modes), S&H
Waveshaper (5 shapes)

Modulation
12 LFO-units available to each voice (6 are running on each voice and 6 are shared for the scene)
DAHDSR envelope generators on every LFO-unit
7 deformable LFO-waveforms + 1 drawable/stepsequencer waveform
LFO1 allows envelope retriggering when used as stepsequencer
Extremely fast and flexible modulation routing. Almost every continuous parameter can be modulated.

Effects
8 effect units arranged as 2 inserts/scene, 2 sends and 2 master effects
9 top-quality algorithms: Delay, Reverb, Chorus, Phaser, EQ, Distortion, Conditioner (EQ, stereo-image control & limiter), Rotary speaker, Frequency shifter

System Requirements
A computer running Windows 2000/2003/XP (32/64-bit) or newer
The computer's CPU must support the SSE instruction set. This is supported by Intel Pentium 3/4/M and AMD Athlon XP/64 (and newer) processors.
A VST-compatible Host application
An x64-compatible CPU, OS and Host is required to use the 64-bit version