A set of dataset management and statistical tests plugins for Excel '97 and 2010 including single and multiple linear regression, polynomial regression, and scatter plot with fit, fit confidence and prediction bands.
MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages, including C, C++, Java, and Fortran.
Netvibes offers a free personal web dashboard for following feeds, friends and using the provided apps. A premium account includes functionality for analytics, tagging, curation, alerts, sentiment analysis, and search.
R is a free software environment for statistical computing and graphics. R can be run from the command line, or using any of the many graphical user interfaces available on a variety of platforms; these are listed as separate tools.