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Is a cross-platform software package for econometric analysis, written in the C programming language. It is free, open-source software. gretl is a software tool developed for users who frequently work with econometric analysis, by providing them with a bunch of useful features.

It is possible to show data set values, get summary statistics, build a frequency distribution or box plot, edit attributes and values, as well as to add a log and to define new variables.

Features:

Easy intuitive interface (now in French, Italian, Spanish, Polish, German, Basque, Portuguese, Russian, Turkish, Czech, Traditional Chinese, Albanian and Greek as well as English)
A wide variety of estimators: least squares, maximum likelihood, GMM; single-equation and system methods
Time series methods: ARMA, GARCH, VARs and VECMs, unit-root and cointegration tests, etc.
Limited dependent variables: logit, probit, tobit, interval regression, models for count and duration data, etc.
Output models as LaTeX files, in tabular or equation format
Integrated scripting language: enter commands either via the gui or via script
Command loop structure for Monte Carlo simulations and iterative estimation procedures
GUI controller for fine-tuning Gnuplot graphs
Links to GNU R, GNU Octave and Ox for further data analysis