RollDB is a secure* die rolling platform that eliminates the need for e-mail; it permits users to roll dice with a user-specified ID, then stores the result as both a number and a human-readable plaintext that logs all the input.
http://rolldb.homoeoteleuton.com/index.php
I'm still working on a robust dice parser, so for now it makes do with some custom functions. So far the robust dice parser supports separating out rolls into pools, but not doing anything individually with those pools; it will be possible to sum them up (e.g. weapon damage and Rogue sneak attack damage in D&D can be in the same pool), as well as compare them for successes, keeping the highest/lowest dice, reroll certain results, per-die and per-pool modifiers, exploding dice, etc.
RollDB's in development robust roller separates things out into pools (formatted notation is item, item; item, item, item; item for three pools with two, three, and one item respectively), and then processes all functions over the dice at the same time.
*Secure as in "prepared statements and server-side functionality", not secure as in "literally random".