 One of the most promising user interface paradigms during this period was hypertext.The technology had been inspired by Vannevar Bush's "Memex" and developed through Ted Nelson's research on Project Xanadu, Douglas Engelbart's research on NLS and Augment, and Andries van Dam's research from HES in 1968, through FRESS, Intermedia, and others.Many small self-contained hypertext systems had been created as well, such as Apple Computer's HyperCard (1987).