Gnosis
@ http://gnosis.org/welcome.html
Large collection of public domain works for gnostic studies.
UbuWeb
@ https://www.ubu.com/
Shadow library of avart-garde artifacts.
Monoskop
@ https://monoskop.org/Monoskop
Shadow library with resources on media arts, infromation science, and culture.
Textfiles
@ http://www.textfiles.com/
Popular website with an archive of early-Internet era content, especially BBS.
Urbigenous Library
@ https://urbigenous.net/library/
Cyberculture and counter-culture texts preserved in a hypertext shadow library.