[1] GitHub - unified-font-object/ufo-spec: The official Unified Font Object specification source files., 2023-08-25T09:16:18.000Z https://github.com/unified-font-object/ufo-spec

[2] Overview, 2023-07-07T11:31:09.000Z, 2023-08-25T09:16:31.249Z https://unifiedfontobject.org/