Registries - Provismet/Gimme-That-Gimmick GitHub Wiki
Gimme That Gimmick contains several dynamic registries for creating custom items or effects.
Each dynamic registry created by GTG has an associated data generator that can be accessed from the API package.
For registries that create items, the items can be given to players via the /gimme-that-gimmick give subcommands. Alternatively, one can define the items using Filament to produce versions with unique identifiers.