https://tunefish-synth.com/index.php/
Tunefish is a very tiny virtual analog synthesizer. It is developed to fit into about 10kb of compressed machine code while still producing an audio quality that can compete with commercial synthesizers.
Available on Windows and Linux as VST (32 and 64 bit) and on Mac as Audio Unit or VST
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