I'm talking about notebooks, calculators, GM screens, laptops, anything you use to organize and run your game. Personally, I use a scribbler, printed NPC stat blocks, GM screen, poker chips as edge tokens, an iPad for music, and a battle mat with dry-erase markers and 1-inch square card stock tokens with PCs and NPCs on them. I use to run my games theater of the mind but I'm liking the battle mat. What do you use?