In the world of Hai:
Hai has a die roller now. Check out the formatting page for the notation. It's basically [ ROLL ] 1d6 [ /ROLL ] or [ ROLL 1d6 ] (without the spaces).

It supports XdY, XdF (Fudge/Fate dice), and Xd% (percentile). And you can add/subtract bonuses (XdY+Z), so all of these are valid:

1d6
2d8+3
4dF-1
d%
4d8e (8's "explode" and are rolled again)
4y
I am 54 (1d%) thrilled.
4y
Odd... it acts like it's going to work and then doesn't... posts only maybe?
4y
Whoops! Indeed. Should be fixed now: 81 (1d%)

(Try editing your comment and it should take.)
4y
Yup!
4y
Incidentally, all edits to a post are recorded, and I've made a note to do the same for all comments. So you'll be able to go back and look at any posts or comments to ensure someone didn't alter the roll's result.
4y
What happens if I try to edit a post with a roll-that-has-already-been-rolled? 0 (42dF)

Oh, nifty...
Cheating?

13 (2d6)

OK, Honour system then :P

Also, suspicious of that zero...

-2 (42dF)-3 (42dF)-8 (42dF)1 (42dF)

Ah, case sensitive Fs

0 (1df)0 (1df)

I don't know.

0 (dF)0 (df)-1 (1dF)0 (1df)
4y
Well, as I wrote above, I will be recording all changes to comments and will display them as well.

But also, yeah, to an extent there's only so much you can do to stop cheating.
4y
54 (5d10e)

Hmmm ... is there ay way to add an option to show the specific die rolls as well? It would be nice to know what the values of each die was.
4y
Certainly possible! I'll add that to the feature list.