You can download this Excel workbook to have easy access to basic statistics distributions on your computer. The workbook includes Z, t, F, chi-square, and binomial distributions as well as selected computations such as estimating the median for grouped data.

UCLA’s Statistical Calculators

This site has calculators and plotters for many distributions, their inverses, their densities.

Daniel Sloper’s Statistics Calculators

Lots of ads but excellent online calculators for many distributions and statistics