I am specifically asking about software and needed libraries, not stuff like Wikipedia or the writings of Ernest Hemmingway.
To keep people from archiving all of github on thousands of shucked external hard drives cobbled together all Frankenstein-y to create a postapocalyptic data center assume a ~1TB storage limitation. Though I’m sure that person exists here on Lemmy somewhere :D
As much as I dislike Microsoft, the world runs on Excel, so it’s got to be near the top of the list.
For myself… calibre and my ebook collection and all the games I can manage.