MS1010, MS137 VCF, MS305, MS507 Dual ADSR Envelope/Dual VCA and MS237 Dual 12db VCF are among WYWSs most popular products.
Ms-20 style filter
Dual Cycling AD/AR Envelope
Step Sequencer
MS20 Filter Clone
Designed mainly for CV but will work fine with audio.
Dual MS20 Filter with LP/Both/HP modes
3340 based oscillator
Dual ADSR Envelope/Dual VCA
Polivoks filter