This ones been out for a while, but haven't seen it mentioned here ...
HY-POLY by HY-Plugins.
There is a paid version for $60, but there is a limited free version.
It’s a subtractive type poly phonic synthesizer with midi effects and audio effects.
And many of synth and audio fx parameters can be modulated.
You can create wide variety of synth sound with those midi/audio fx and modulations
Format:
VST2, VST3(32/64bit) for Windows
VST2 , VST3 and AU(64bit) for macOS
System Requirements:
Win : Windows7 or higher
Mac : OSX 10.9 or higher
Free version
Main Features:
1 oscillator mode
Maximum number of voices is 4
No midi effect unit
5 audio effect units
Download