Online dice rollers list:
https://rolz.org/
http://rolldicewithfriends.com/
http://a.teall.info/mdice/
http://unseenservant.com/
These should allow GM and player to see/share results.
Also, for personal use:
https://dice.campaign-logger.com/
https://www.google.com/search?q=dice+roller...
Dice Codes
1d6: roll one six-sided die
2d6: roll two six-sided dice
2d6+3: roll two six-sided dice and add 3 to the result
2d6-7: roll two six-sided dice and subtract 7 from the result
1d30, 1d12, 1d100+1900: roll one 30-sided die, one twelve-sided die, and one 100-sided die and add 1900 to it...