@RISK - @RISK is the world's most widely used risk analysis tool.
gretl - homepage of gretl, the Gnu Regression, Econometrics and Time-series Library
TreePlan - TreePlan helps you build a decision tree diagram in an Excel worksheet using dialog boxes.
EViews - EViews (Econometric Views) is a statistical package for Windows, used mainly for time-series...
Duckling Sales - Duckling Sales is a software to build decision trees for your business.
SAFE TOOLBOXES - SAFE TOOLBOXES is an Excel add-in that enhances Excel capabilities to perform simulations...