Pre-filled queries. The input form can accept a wide variety of queries. By clicking on one of the buttons, the input field gets pre-filled with a relevant request. Then you can modify the request to get the desired answer.
Calculator. If you write a math formula that a simple calculator can evaluate, then you will see the end result of the calculation.
Random sampling. You can specify one of the available probability distributions, its parameters, and the number of samples that you want to have generated.
Random permutations. The program can also generate random permutations. You need to provide the smallest and the largest integer in the permutation. You can also ask for several permutations, and in that case you can ask whether you want them displayed horizontally or vertically.