If you want to get really broad, many of the AD&D modules published by TSR from 1983-86 were technically in their own "worlds" since they weren't in Greyhawk -- C3, C4-5, C6, H1-2*, I2, I3-5*, I6**, I7, I8, I9, I10**, I11, I12, I13, MV1, N2, N3, N4*, UK4, UK5, UK6, UK7
*later retrofitted into...