Quantitative skills are becoming increasingly essential for both professionals and researchers in the social sciences. While there have been many statistical tools available for us, some of them are generally more popular and useful depending on what kind of data analysis you require. Among them are Python, R, Matlab, Stata, SAS, and Eviews. They are abundant online resources to learn those quantitative tools, many of which are free or not costly. You can find them in the following links:
http://www.spatial-econometrics.com
http://www.eviews.com/Training