RomaFS is a Ruby implementation of FUSE (Filesystem in Userspace) that allows developers to create virtual filesystems in Ruby. FUSE allows filesystem implementations to export operations like open, read, write, close, readdir, getattr, unlink, mkdir, rmdir, etc. through the Linux, FreeBSD, Mac OS X and Windows kernels. Examples of FUSE filesystems include SSHFS for mounting remote directories over SSH and FuseFS for Ruby. RomaFS is hosted on GitHub and provides a Ruby API for developing FUSE filesystems.