AVFS (A Virtual File System) is an easy-to-install system that enables all programs to access archived, compressed, remote, or other kind of virtual files without the need to recompile programs or the kernel. The following modules are currently implemented: tar, zip, rar, gzip, bzip2, ftp, http, dav, rsh/ssh, floppy, and many more.
autofs is a kernel-based automounter for Linux. It performs a job similar to amd but relies on a small stub of kernel code instead of pretending to be an NFS server. The result is simpler code, better reliability, and much faster operation in the common case (everything already mounted). Autofs 4 adds support for automounting trees of exported filesystems via /net.
BeFS-driver for Linux is a read-only Linux 2.4 filesystem driver for the Be filesystem, the native filesystem of Be (includes BeOS). The basic features (directories and files) are stable, and robust. It is distributed as a source tarball and as a patch against the latest 2.4 kernels.