Recent developments in the PySCF program package

PySCF is a category-defining project in computational chemistry. While the provided metadata shows low stars (likely due to the ArXiv link provided), the project is the de-facto standard for Python-based quantum chemistry research. It bridges high-performance C/C++ backends with an extensible Python frontend. Its defensibility is derived from deep domain expertise and a massive ecosystem of academic plugins. Frontier labs are users of this software (e.g., Google's OpenFermion) rather than competitors.