RADIS resolves spectra with millions of lines within seconds on a single-CPU and can be GPU-accelerated. It supports HITRAN, HITEMP and ExoMol out-of-the-box (auto-download), and therefore is particularly suitable to compute cross-sections or transmission spectra at high-temperature. RADIS includes equilibrium calculations for all species, and non-LTE for CO2 and CO.
https://ui.adsabs.harvard.edu/abs/2019JQSRT.222...12P , https://ui.adsabs.harvard.edu/abs/2021JQSRT.26107476V ; please see additional citation information here: https://radis.readthedocs.io/en/latest/references/references.html#cite