libfuse / libfuse

The reference implementation of the Linux FUSE (Filesystem in Userspace) interface

trapexit / mergerfs

a featureful union filesystem

hanwen / go-fuse

FUSE bindings for Go

fangfufu / httpdirfs

HTTPDirFS is a filesystem that allows you to mount arbitrary websites using the FUSE framework. It comes with a cache system, and Airsonic / Subsonic server support.