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Computing and using opacities is a key part of modeling and interpreting dataof exoplanetary atmospheres. Since the underlying spectroscopic line lists areconstantly expanding and currently include up to ~ 10^10 - 10^11 transitionlines, the opacity calculator codes need to become more powerful. Here wepresent major upgrades to the HELIOS-K GPU-accelerated opacity calculator anddescribe the necessary steps to process large line lists within a reasonableamount of time. Besides performance improvements, we include more capabilitiesand present a toolbox for handling different atomic and molecular data sets:from downloading and pre-processing the data to performing the opacitycalculations in a user-friendly way. HELIOS-K supports line lists from ExoMol,HITRAN, HITEMP, NIST, Kurucz and VALD3. By matching the resolution of 0.1 cm^-1and cutting length of 25 cm^-1 used by the ExoCross code for timing performance(251 seconds excluding data read-in time), HELIOS-K can process the ExoMol BT2water line list in 12.5 seconds. Using a resolution of 0.01 cm^-1, it takes 45seconds - equivalent to about 10^7 lines per second. As a wavenumber resolutionof 0.01 cm^-1 suffices for most exoplanetary atmosphere spectroscopiccalculations, we adopt this resolution in calculating opacity functions forseveral hundred atomic and molecular species, and make them freely available onthe open-access DACE database. For the opacity calculations of the database, weuse a cutting length of 100 cm^-1 for molecules and no cutting length foratoms. Our opacities are available for downloading fromhttps://dace.unige.ch/opacityDatabase and may be visualized usinghttps://dace.unige.ch/opacity.

HELIOS-K 2.0 Opacity Calculator and Open-source Opacity Database for Exoplanetary Atmospheres