Cynthia Micro is a small subtractive synthesizer that aims to be as juicy and fun as possible with a minimal set of controls.

2 oscillators with 5 waveforms and split knobs
FM controls to modulate oscillator 1 or 2
Low pass filter
Envelope modulation for FM, filter, and volume
Vibrato for oscillator 2 or oscillator 1+2
8 voice polyphony and legato mode
Cynthia Micro is free and open-source

https://tesselode.itch.io/cynthia-micro