kx77free has released a fairly comprehensive VST synth that uses a combination of subtractive and additive synthesis. The features list contains some useful features, like plenty of envelopes and LFO's, 2x filters and the like.
Features:
Full parameters controls to make Additive Waveforms with no aliasing.
Full 32 bit High Quality Waveforms.
Same quality for all clock frequencies: 44.1 khz to 192 khz.
independent WaveTracer engine: KxWaveTracer.exe.
Stereo routing.
All modulations are pre-connected, no cables on the GUI.
3 Polyphonic EGs with for each segment: curves, velocity and Kbd controls.
1 Monophonic EG with for each segment: curves, velocity and Kbd controls.
Multiple trigger sources and sync for the EGs and the LFOs.
2 Oscillators with 2 waveforms and 2 outputs with Phase modulation and Sync.
2 independent Sub Oscillators.
2 Monophonic LFOs with 2 Rates and ASR EG.
2 Mulitmode VCFs.
Mixer with 6 sources: Noise, Vco1 1-2, Vco 2 1-2, Ring, Vco1 Width, Vco2 Width and 3 outputs: VCF1, VCF2, VCA.
Each mixer voice can be modulated by different sources.
Noise Generator with an EQ.
Sample&Hold.
Ring Modulator.
6 host sync clocks.
2 Midi inputs.
1 Distortion.
2 Delays with sync, multimode filter and modulation oscillator with sync.
Full NRPN implementation: More 500 parameters.
128 presets
