I would like to know some GNU libraries or lists of downloadable Tersoff potentials. I couldn't find that many of them, and I also would like to know if there is a reason as to why this is the case.
It certainly contains an implementation of Tersoff potentials, unfortunately, I am not an expert in molecular dynamics and cannot say if that is enough for your simulation.
This library currently has built-in implementations of the following potentials that employ Tersoff's functional form:
and you can upload yours.
Regarding the list of potentials: