Chow Kick Drum Synthesizer 

Chow Kick is a kick drum synthesizer based on creative physical modelling of old drum machine circuits.

Along with a highly parameterizable pulse shaper, Chow Kick uses a resonant filter with several nonlinear modes, creating a wide range of possibilities for sound designers.

The kick drum can also be easily “tuned” with incoming MIDI notes to match the key of your song

See also the other free plugins Chowdhury DSP on the download page