Lessfs is a high performance inline data deduplicating file system for Linux. Lessfs complies to the POSIX standard and is very useful for backup purposes as well as providing storage for virtual machine images. Although lessfs is a file system that is implemented in user space with FUSE, it offers decent performance. Lessfs is capable of handling data rates up to 350MB/sec. It supports filesystem encryption.
fsprotect is a set of scripts that combine tmpfs and aufs to make existing filesystems immutable. After the filesystems are protected, everything that is written will be lost when the computer powers off. It is a great tool for testing and for public computers like those in schools, libraries, etc. It is also very easy to use. It is currently available only for Debian-based systems.
qemu-diskp is a FUSE mounter to mount virtual disk images. Most virtual machine environments provide a raw disk model to the operating system(s) they host. Typically this raw disk is stored as a simple file rather than a dedicated hardware device. Since the file is a bit-image of what would normally be an actual hardware disk, it holds a complete disk layout. This makes it difficult to mount or manage each of the filesystems within that virtual disk image by the host machine, especially if the file for the image is itself a composite, such as a qemu qcow2 file. This project provides a FUSE based filesystem that presents each of the partitions in a full disk image as individual files. Those files may then be accessed by user-level applications (e.g. fsck or mke2fs) or loop-back mounted, enabling normal file system tools to examine or modify their contents.
Hgfs is a read-only filesystem interface to Mercurial repositories. The interface gives access to the commit message, manifest, and files of each revision, and to .tgz's of each revision (the .tgz's are generated as they are read). The filesystem is a front-end for the Mercurial library that comes with it. All code is written in Limbo, for Inferno.
FSter is a virtual filesystem implementation based on FUSE and exploiting Tracker's indexer to allow access to files according to the metadata with which they’re associated. Its behavior is highly customizable with XML configuration to describe in detail the desired hierarchy of files.
losetup-utils are three bash scripts that attempt to make the use of losetup a bit easier and faster. losetup can be fast, easy, and practical if you need to transport sensitive information over the Internet or in CD's, DVD's, or a pendrive. Also, if you want to store private data on your hard disk or in the cloud, an encrypted volume can be a convenient choice. The types of encryption can be any installed on the system.