All of the following resources are interactive and great for teaching online or on an interactive whiteboard. Spending a little time exploring the options allows them to be used to their full potential.

Using google, search 'dice roller' - polyhedral dice with 4, 6, 8, 10, 12 or 20 sides
www.diceroll.fun - polyhedral dice as above, but also % dice to generate a 2-digit number
https://content.connect.collins.co.uk/Content/Live/ElektraMedia/Busy_ants/Foundation/GamesandTools/34_IMT_Dice/index.html - up to 3 dice with from 2 to 10 sides, showing adjustable dots or numbers