Meaningful calculations of risk
From one point of view, it's tempting to boil estimates down to a figure. "It'll take three days" is easy to plan with. However, treating estimates as firm commitments is risky. How risky? It depends.
From another point of view, giving estimates is taking a risk, too. For example, a contractor giving a quote to a potential client might be tempted to give an optimistic estimate. How much risk is involved? Again - it depends.
Estigator calculates probabilities. This helps stakeholders visualise, quantify and have meaningful discussions about the risk inherent in estimates.
Do sums with uncertainties
Estimation usually gets easier if it can break it down as a sum of smaller parts. Adding up a series of estimates and getting a total... that part's easy. Crucially, Estigator tells you about distributions as well.