  Since the universe is not transparent to gamma rays with energies above
around one hundred GeV, it is necessary to account for the interaction of
high-energy photons with intergalactic radiation fields in order to model
gamma-ray propagation. Here, we present a public numerical software for the
modeling of gamma-ray observables. This code computes the effects on gamma-ray
spectra from the development of electromagnetic cascades and cosmological
redshifting. The code introduced here is based on the original
$\gamma$-Cascade, and builds on it by improving its performance at high
redshifts, introducing new propagation modules, and adding many more
extragalactic radiation field models, which enables the ability to estimate the
uncertainties inherent to EBL modeling. We compare the results of this new code
to existing electromagnetic transport models.
