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We present our implementation  autoCAS  for fully automated multiconfigurational calculations, which we also make available free of charge on our webpages. The graphical user interface of  autoCAS  connects a general electronic structure program with a density‐matrix renormalization group program to carry out our recently introduced automated active space selection protocol for multiconfigurational calculations (Stein and Reiher, J. Chem. Theory Comput., 2016, 12, 1760). Next to this active space selection,  autoCAS  carries out several steps of multiconfigurational calculations so that only a minimal input is required to start them, comparable to that of a standard Kohn–Sham density‐functional theory calculation, so that black‐box multiconfigurational calculations become feasible. Furthermore, we introduce a new extension to the selection algorithm that facilitates automated selections for molecules with large valence orbital spaces consisting of several hundred orbitals. © 2019 Wiley Periodicals, Inc.

autoCAS : A Program for Fully Automated Multiconfigurational Calculations