The Endorphin.es Godspeed+ is sort of the single oscillator version of the famous Furthrrr Generator. From its big brother it takes over the digital Thru-Zero core and the legendary wavefolder. But it also has new features like a suboscillator output and an immensely practical autotune function.

Slim and skiff-friendly 6hp VCO with autotuning and octave shift
Strong Zero VCO core delivers powerful thru-zero linear FM
cv-controllable modulation index with pre-patched self-modulation
sine/fold output features famous Furthrrr Generator folder
odd+/even output plus additional sub-oscillator out for deeeep basses