Possibly useful:

You can ask Google to flip a coin for you.

Also, typing d4, d6, d8, d10, d12, or d20 will roll a die. (Or just search for “dice roller”.)

You can add dice, or declare a constant to be added to the total, using the icons at the bottom.

Also: calculator, metronome, color picker, spinner (including a virtual fidget), breathing exercise for meditation.