mergerfs is a union filesystem for FUSE. It allows to join multiple source directories, declare priority mappings for file operations, to provide a joined view to the underlying files. It's similar to mhddfs, unionfs, and aufs; but allows for accessing standard and extended attributes.
GParted is a hard disk partitioning application commonly used from LiveCDs. It allows to created and modify partitions, label, check, copy and move, or resize common filesystems. GParted works on legacy MBR bootsectors or GUID partition tables (GPT). Supported filesystems include ext2/3/4, btrfs, f2fs, FAT16/32, hfs/hfs+, lvm2, NTFS, reiserfs/4, ufs, and xfs.
AVFS is a system, which enables all programs to look inside gzip, tar, zip, etc. files or view remote (ftp, http, dav, etc.) files, without recompiling the programs. AVFS can be used with FUSE to enable access to archives from any application. AVFS can also be used as a stand-alone shared library if FUSE is not available or unwanted.
Gfarm is a network shared filesystem and alternative to NFS, but optimized for reliability, scaling and access from wide area network. It can federate local disks of network-connected PCs and compute nodes in several clusters, and supports explicit replica location control by users. Plugins exist for FUSE, Zabbix, Hadoop, Samba, MPI-IO, GridFTP, and a Linux kernel module is under development.
AppFS is a FUSE-based filesystem that presents a filesystem view of remote packages presented via HTTP for the purpose of running software without the hassle of installing it. Instead, as files are requested they are downloaded and made available.
FUSE for OS X provides foreign filesystem support under Mac OS X. It's the successor to MacFUSE. And like the Linux variant it provides a user-land filesystem driver API, which is easier to develop for. Command-line tools are provided, and a kernel module which facilitates binding drivers like sshfs, procfs, AccessibilityFS, GrabFS, LoopbackFS, SpotlightFS, and YouTubeFS to the file system.
FATx is an implementation of the XBOX FAT16/32 filesystem variant. It comes with command-line implementations of mkfs, fsck, label, unrm for undeletion, and fusefatx for mounting an Xbox partition.