When I GM, I often do so in my rec room, sitting in an easy chair, rather than at a table. At such times, rolling large amounts of dice can be problematic, particularly with systems that use a dice pool. With most systems there is typically some mental activity required to interpret the dice (looking for sets, checking how many are over a threshold, adding them all up, etc.) that can be time consuming and/or taxing when one is running - for example - a combat with a large number of NPCs. It's fine for the players - they only need to keep track of one character - but sometimes the GM can use a bit of help.
So, I use dice sheets in most of my games (yes, the players still use dice). These are HTML pages with Javascript that generates random results for whatever game I am running and does some basic interpretation (identifies matches in ORE, totals the result for FATE, etc.) I usually print out a couple of new pages before a game. Anyone is welcome to use these; you can even save them webpage to your PC. Just hit the refresh button on your browser to generate a new page of random results. I recommend adjusting the Page Setup settings of your browser before printing them out as some sheets put a lot on one page; margins of 0.3 inches and no header or footer works fine.