In the past few years, we have covered a whole host of apps for statistics and probability students. StatSuite is also worth a look. It is a handy app that can compute statistics and their confidence intervals and chart data. It can handle linear, polynomial and multiple regression and probability calculations for a bunch of common distributions.
This app can solve common problems you are going to face in a statistics course. It can find you the sample size needed for hypothesis testing. You can also train neural networks for regression and classification. This app is compatible with cloud services such as Dropbox. You can find out more about it here.