Here are some graphs

Platonic Dice Probability

This graph shows the chance of getting each total if all five platonic dice are rolled. The platonic dice are a D4, D6, D8, D12 and D20. The graph was made using a monte carlo simulation on Microsoft Excel.

Four D6 Probability

Here is a similar graph for rolling four D6 dice also made using a Monte Carlo simulation on Excel.

Ten D6 Dice Probability

Here is another similar graph for ten D6 dice.

D4, D6, D20 Dice Probability

Here is another similar graph for D4, D6 and D20 dice rolled together.