There are 4 repositories under kbfs topic.
Keybase Go Library, Client, Service, OS X, iOS, Android, Electron
Keybase Filesystem (KBFS)
Keybase File System (KBFS)-backed CLI-based password manager
FreeBSD service daemon for KBFS, the Keybase filesystem
Docker image for keybase's KBFS
Shutter upload plugin for the Keybase filesystem (KBFS)