Timeline Fracture is a setting that brings together any D20 setting you like in one game.
From the campaign:
Timeline Fracture is a tabletop RPG campaign setting that allows you to use every d20 book (3.0, 3.5, etc), regardless of genre. It lets you take any of the races, classes, weapons, feats and skills from any d20 book and create the most interesting characters you can imagine. When creating a campaign, the setting allows you to use the diverse material in a coherent and consistent way.
Timeline Fracture allows you to get the most out of all of the d20 books you own, breathing new life into them. If you discover new d20 books of any setting, they can be used to enhance Timeline Fracture even further.