How fancy do you want the dice to be?
I know of a few online dice rollers. Discord has a bot named sidekick that's pretty good. I know of two online rolling sites with logs that I use for play by post,
dicelog and
rolz. And
rpol's roller is pretty powerful too, if you have a dummy game you can roll in.
my primary dice roller is inspiration pad from nbos. Which doesn't come with dice tables, but it takes like 20 seconds to write the dice table you need.
Code:
Table: 3d6Roll
{3d6}
I've also got the hit location table coded so I don't have to do lookups, and a bunch of other random generators (probably over 100)... its a really powerful tool, and yes, it lets you roll a bunch of dice at once. Its not a pretty one though, and writing the dice yourself might be intimidating... though I suppose I could send you some of my files.
none of these are really "pretty", but they're all powerful and functional.