KNAUS (2020): Double machine learning based program evaluation under unconfoundedness https://arxiv.org/abs/2003.03191
R-package causalDML https://github.com/MCKnaus/causalDML
LECHNER (2018): Causal machine learning estimator to estimate mean effects at different aggregation levels as discussed in my paper Modified Causal Forest https://arxiv.org/abs/1812.09487
The most recent Python version is available on https://pypi.org/project/mcf/ (pip install mcf).
LECHNER, HUBER, STEINMAYR (2012): RADIUSMATCH: Stata module to perform distance-weighted radius matching with bias adjustment https://econpapers.repec.org/software/bocbocode/s457575.htm
This module should be installed from within Stata by typing "ssc install radiusmatch".