If you are someone with a passion for statistical analysis or someone with an absolute hatred and a need for assistance perhaps you could do with this piece of software to help. It's a rather complete package and as someone who dropped mathematics at the first opportunity it certainly has enough to keep me confused. Advanced Statistical Tables allows users to calculate PDF, CDF and inverse CDF for distributions including Gaussian, Student's t, F and chi-square.
One of the best features for me is the quick reference on parameter ranges and applications which all come with online help that is quick and easy to read and, importantly, to understand. The range of distributions is staggering encompassing exponential, gamma, beta, negative, geometric and poisson and they all come in original Greek font.