From its creation in 2014 (originally available on SVN) to my last day in ATLAS (31/03/2023), I significantly contributed to the xAODAnaHelpers analysis framework used widely in the ATLAS Collaboration to process ATLAS data. My contributions were developing, providing user support, and reviewing and approving other people's contributions.
This framework consists of C++ algorithms which are scheduled in Python.
Repository: https://github.com/UCATLAS/xAODAnaHelpers
Documentation: https://xaodanahelpers.readthedocs.io/