Tunefish 4

Originally developed for the demoscene, Tunefish is a nice free VST synth.

Improved UI compared to TF3 which will visualize all modulations.

Uses an additive synthesis based wavetable generator.

The Noise generator can produce any frequency of noise with any bandwidth.

Lowpass, Highpass, Bandpass and an improved Notch filter are available.

2 ADSRs and 2 LFOs that can be linked to pretty much any important knob using a modulation matrix.

Supported effects are Flanger, Chorus, Distortion, Delay, Reverb, EQ and Formant.

The effects stack allows for any permutation of up to 10 effects.

If you use it often you should consider a donation.