Description:
Psi4 is an open-source suite of ab initio quantum chemistry programs designed for efficient, high-accuracy simulations of molecular properties. We routinely perform computations with >2500 basis functions on multi-core machines.
With computationally demanding portions written in C++, exports of many C++ classes into Python via Pybind11, and a flexible Python driver, Psi4 strives to be friendly to both users and developers.