Name generators, maps of cities, weather on certain dates, face claim heights/weights/ethnicities, basic math, prompts... I almost always have 2 or 3 google tabs open. If I'm writing for a fandom, I'll have their wikia open whenever I'm working on it, mostly to check timelines. I also compulsively collect appropriate music. Almost all of my RPs have playlists. [s]I'm not neurotic, what are you talking about[/s]