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petitRADTRANS (pRT) is a fast radiative transfer code used for computing emission and transmission spectra of exoplanet atmospheres (Mollière et al., 2019), combining a FORTRAN back end with a Python based user interface.It is widely used in the exoplanet community with 222 references in the literature to date, and has been benchmarked against numerous similar tools, including many listed in (MacDonald the availability of both correlated-k and line-by-line opacities, free, equilibrium, and disequilibrium chemistry, and multiple cloud implementations in a single framework let it stand out as a uniquely flexible approach to atmospheric retrievals.
Nasedkin et al. (Tue,) studied this question.