Apple's programming tool of 1987, created by Bill Atkinson, for building stacks of linked cards with text, images and sound. It anticipated the web and was used for early interactive art and games.
And even before that, I think I cut my teeth on HyperCard, which is almost forgotten these days, but it was all there.
Auriea Harvey, 1990s Net Art: Auriea Harvey, Joshua Davis, LIA, Draves
In the early ‘90s and late ‘80s, the HyperCard (1987) software was really essential. A lot of poets and a lot of artists were making HyperCard stacks in this multimedia environment to make generative work with.
Casey Reas, Casey Reas on the History of Generative Art - Part 2