SMath Studio - Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.
Base SAS - Base SAS Software is an easy-to-learn fourth-generation programming language for data access, transformation and reporting.
PTC Mathcad - PTC Mathcad PTC Mathcad is Engineering Math Software That Allows You to Perform, Analyze, and Share Your Most Vital Calculations.
IBM SPSS Statistics - IBM SPSS Statistics is software that provides detailed analysis of statistical data. The company behind the product practically needs no introduction, as it's been a staple of the technology industry for over 100 years.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Stata - Stata is a software that combines hundreds of different statistical tools into one user interface. Everything from data management to statistical analysis to publication-quality graphics is supported by Stata. Read more about Stata.