Chowdhury DSP has released ChowKick, free kick drum synthesizer plugin for Windows and Mac (VST/VST3/AU/LV2).
ChowKick is a kick drum synthesizer based on creative 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.