Forged in the Dark game that lets you use any official playbook from the Evil Hat books (eg Blades in the Dark, Scum and Villainy, Band of Blades, Iruvia) with a little massaging, a mosaic setting
one of my formative experiences in roleplaying was playing a Gamma World mutant in a game of regular D&D 4e set in Eberron thanks to a cosmic accident thanks to a congenial GM willing to work with me to convert stats back and forth, and I think combining games in a shared engine is genuinely a fun thing that should be done whenever possible
one of my most ambitious goals in gaming is a series of linked one shots in the Gumshoe engine in a James Ellroy influenced haunted alphabet agency story, akin to the four volume Yellow King box set but using the following four games and eras
Trail of Cthulhu: 1930s The Fall of Delta Green: 1960s Night's Black Agents: 1990s The Esoterrorists: Present Day
Thirty Year Cycles: A GUMSHOE History of Esoterica
