TreePlan Software provides decision analysis add-ins for Excel: TreePlan for decision trees, Sensit for tornado charts, and SimVoi for Monte Carlo simulation
TreePlan TreePlan for decision trees to create your own Excel model and format as you wish Single-license TreePlan Pro $59
Sensit Sensit for sensitivity analysis of your Excel what-if model with tornado charts and spider charts Single-license Sensit Pro $59
SimVoi SimVoi for Monte Carlo simulation of your Excel what-if model with value of information Single-license SimVoi Pro $79