UCHRONIA: THE ALTERNATE HISTORY LIST is a website (via David Nishimura at Cronaca) that lists thousands of printed works of "alternate history" (the history of what might have happened but didn't in our world), both fictional and scholarly. It happens that the book I am currently writing on Christian transmission of the Jewish Pseudepigrapha uses "alternate history" as a tool to help understand how the Pseudepigrapha were passed down. This site will be extremely useful to me. Thanks David!