101 player character background hooks that can be used in many different types of settings. These hooks vary from small hooks (potentially one adventure worth of material) to long hooks (campaign long ideas). See both pages.
Resources: Player Aides
101 player character quirks that can be used in many different types of settings. These quirks vary from small quirks (small effect on game play) to big quirks (potentially large effect on game play).
A Glossary of Common Tabletop Acronyms, Abbreviations & Terms
This tool generates the world known by the PCs and the history they have heard of. You can always introduce small bits of information that may make the players see things under a different light or even reveal a shocking hidden truth about it all.
Essays, games, supplements and original larps by Quinn Murphy, Rich Rogers, Arlene Medder, Brendan Conway, Meguey Baker, Mark Diaz Truman, John Wick, Shoshana Kessock and Jenn Martin.
This aid by Paulo Rivas López is meant to help the players and the Narrator to build the setting of the game together as well as getting to the same page in respect to some of each others expectations. It includes a new trick too: to handle Fronts (that stands for all kind of plot-relevant organizations such as a guild of thieves, a kingdom, a company, a ship, etc), you just roll 6d6 and list those numbers as the Front stats, or place the dice over the hexagons in any order you want.
Compiled by the members of story-games.com, this classic resource breaks names down into over a hundred categories and genres, with lists ranging from fantastical and historical names to contemporary and humorous ones.