OpenMolcas

OpenMolcas is a quantum chemistry software package developed by scientists and intended to be used by scientists. It includes programs to apply many different electronic structure methods to chemical systems, but its key feature is the multiconfigurational approach, with methods like CASSCF and CASPT2. OpenMolcas is not a fork or reimplementation of Molcas, it is a large part of the Molcas codebase that has been released as free and open-source software (FOSS) under the Lesser GNU Public License (LGPL). Some parts of Molcas remain under a different license by decision of their authors (or impossibility to reach them), and are therefore not included in OpenMolcas.

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