Software Relating to Decision Trees
TreePlan

TreePlan- A Decision Tree add-in for Excel. It helps build the model through text boxes and has built-in formulas for easy use.
Precision Tree 6

Precision Tree 6 by Palisade Corporation- can be used through Excel. You can collapse and expand the branches you create. It also provides a full statistics report that includes a risk profile and sensitivity graph.
Lumenaut Decision Tree

Lumenaut Decision Tree- can also be used through Excel. One-way and two-way sensitivity analysis, spider charts, tornado charts, and risk profiles can be generated.