AParch (Python package)Kevin Sheppard · High-frequency financial analysisKevin Sheppard's Python package for univariate ARCH/GARCH volatility models, bootstraps, multiple-comparison procedures, unit-root and cointegration testsNCSAFreeOpen sourceLocalNov 2, 2026
LlinearmodelsKevin Sheppard · Econometrics & causal inferencePython package by Kevin Sheppard adding panel data, instrumental-variable, system (SUR/3SLS) and asset-pricing estimators missing from statsmodelsNCSAFreeOpen sourceLocalNov 2, 2026
RRR Foundation / R Core Team · Programming languages & runtimesLanguage and environment for statistical computing and graphics, with the CRAN package archive and a strong base in academic statistics and econometricsGPL-2.0-or-laterOpen sourceFreeLocalSelf-hostedNov 2, 2026