With FUSE it is possible to implement a fully functional file system 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

Homepage:
https://github.com/libfuse/libfuse
