@RISK - @RISK is the world's most widely used risk analysis tool.
FixFinder - FixFinder a collection of IT self-help tools that empower users to fix things.
RiskAMP - RiskAMP is a full-featured Monte Carlo Simulation Engine for Microsoft Excel.
Duckling Sales - Duckling Sales is a software to build decision trees for your business.
Yasai - YASAI is an open-source Monte Carlo simulation add-in for Microsoft Excel
TreePlan - TreePlan helps you build a decision tree diagram in an Excel worksheet using dialog boxes.