FUSE: Filesystem in Userspace: "With FUSE it is possible to implement a fully functional filesystem in a userspace program. Features include:
* Simple library API
* Simple installation (no need to patch or recompile the kernel)
* Secure implementation
* Userspace - kernel interface is very efficient
* Usable by non privileged users
* Runs on Linux kernels 2.4.X and 2.6.X
* Has proven very stable over time"