gretl - Gnu Regression, Econometrics and Time-series Library
Gretl is a statistical package.
It was developed mainly for econometrics.
It has as well scripting capabilities as an easy intuitive interface.
It features a wide variety of estimators, time series methods limited dependent variables. It has several times been applied in the Journal of Applied Econometrics.
Allin Cottrell, Wake Forest University Riccardo "Jack" Lucchetti, Università Politecnica delle Marche