Manual Section 4 - Plan 9 from User Space
intro(4) | intro – introduction to file servers
9pserve(4) | 9pserve – announce and multiplex 9P service
acme(4) | acme – control files for text windows
factotum(4) | factotum – authentication agent
import(4) | import – import 9P resources from another system
plumber(4) | plumber – file system for interprocess messaging
ramfs(4) | ramfs – memory file system
srv(4) | srv, 9fs – start network file esrvice
vacfs(4) | vacfs – a Venti-based file system