The Keep on the Borderlands is set in Dyriamarch, a region of Melderyn claimed, but not effectively controlled by that kingdom. There is also a letter meant to be handed to the players before the adventure.
The Harnic Astrology program takes a fully functional and richly detailed Earth-based Astrology Program ("SymSolon") (GNU) and changes the parameters to produce output appropriate for the Harnic Isles and the planet (solar system) of Kethira.