Boba is a FET input stage simulation. Besides bias control, Boba has two controls to set the capacitive coupling of the output, and the negative feedback on the source.
Libra is a pink shelf EQ. A what you say? Essentially tune the notch via frequency to your fundamental, and then apply a width, and a tone slope. It was an experiment in obtaining an easier pink spectrum distribution of harmonics. More an instrument EQ, and not a master EQ.