Unique-but-abandoned Mac-only product, developed by Bill Atkinson (following an LSD trip). Could be a HyperText engine (Beyond Cyberpunk), could be a (mainly single-user) data-backed GUI CardDeck-based development environment. Launched 1987.

Dan Shafer wrote some books about it.

See MetaCard for a close clone, or PythonCard for something similar but a bit different.

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