Squiggle
From Just Solve the File Format Problem
Squiggle is a specialized programming language designed for displaying probability distributions. It can be used for making "Fermi estimates", such as in a test example of estimating the number of piano tuners in New York City by multiplying various estimated ranges such as the total population, fraction who have pianos, and number of pianos a tuner can service.
The output of Squiggle is a graph of the distribution defined by the ranges and calculations given.
