UNISTAT is a very useful tool that can help a lot with analyzing, preparing and presenting data. It is especially useful when the number of data points is large. I like the interface and simplicity. I like that it has a lot of free features, which means that if you get stuck with something, it won't cost you anything extra. It works well with MS Office (including Excel), so if you're familiar with those tools, you'll find it easy to use. It has a nice selection of charts and graphs that you can easily generate. For example, I used it to plot rainfall distribution over a year, and the results were excellent. If you need to analyze data without having a PhD in mathematics, UNISTAT is probably the best option.