Final answer:
The activity not associated with the People's Computer Company was e) developing the world's first graphical user interface, as this was achieved by Apple with the Macintosh in 1984.
Step-by-step explanation:
The People's Computer Company (PCC), a not-for-profit corporation in the San Francisco area, engaged in various activities to democratize computing and make technology accessible to the public.
The activities of the PCC included a) publishing a newspaper that featured the source code for programs, b) allowing people to rent time on a time-shared computer, c) hosting Friday-evening game-playing sessions, and d) promoting a culture in which computer enthusiasts freely shared software.
However, the activity that was not associated with the PCC is e) developing the world's first graphical user interface (GUI). The first GUI was developed by Apple with their introduction of the Macintosh computer in 1984, which was well after the PCC's time and outside its undertakings.