Limdep (short for LIMited DEPendent variable models) is a specialized econometrics software package used for estimating discrete choice, limited dependent variable, and panel-data models — items such as probit, logit, tobit, multinomial logit, Poisson, negative binomial, Heckman selection, and many advanced estimation methods. Version 9.0 is a specific release in that product line; users often search for "Limdep 9.0 free download" and comparisons like "6 top" meaning top alternatives, top features, or top download sources.

Below is a concise, purposeful narrative that covers what Limdep 9.0 is, why people look for free downloads, legal and practical considerations, and six top alternatives or approaches to obtain similar functionality.