libguestfs is a set of tools for accessing and modifying virtual machine (VM) disk images. You can use this for viewing and editing files inside guests, scripting changes to VMs, monitoring disk used/free statistics, P2V, V2V, performing partial backups, cloning VMs, and much more. libguestfs can access nearly any type of filesystem including: all known types of Linux filesystem (ext2/3/4, XFS, btrfs, etc.), any Windows filesystem (VFAT and NTFS), any Mac OS X and BSD filesystems, LVM2 volumes, MBR and GPT disk partitions, raw disks, qcow2, CD and DVD ISO images, SD cards, and dozens more. libguestfs doesn't need root permissions.
SmbSync is a program to move files between Unix and Windows shares directly, avoiding the need for mounts or extra services like FTP or Rsync. It uses input and output directories, and can be configured to handle many directories and servers. It can retry uploads and downloads that fail, avoids incomplete file transfers, does not touch recently modified files with a configurable timeout, can archive files instead of deleting files transferred, can upload or download to temporary directories so that scripts that trigger on the files will only see complete files, and allows you to configure blocksize.
File-Find-Object provides Perl programmers with an object-oriented alternative to the core File::Find module for traversing a directory structure, which has some serious interface limitations. As opposed to File::Find, File-Find-Object can be instantiated, can be interrupted in the middle, has an iterative interface, and can also return results as objects.
MinorFS combines a small set of cooperating userspace filesystems for Linux that provide private storage to pseudo persistent processes. This allows programs that are run by a user to keep some data safe from all potential malware that runs with all this users' privileges. It further implements simple password capabilities as a way to explicitly share access with other processes or users.
movemetafs is a searchable filesystem metadata store for Linux that lets users tag local files (including image, video, audio, and text files) by simply moving the files to a special folder using any file manager. It also lets users find files by tags using a boolean search query. The original files (and their names) are kept intact. movemetafs doesn't have its own user interface, but it is usable with any file manager.
fuse1.pl is a nontrivial demonstration of Fuse.pm, the Perl language interface of FUSE, the Linux userland filesystem. fuse1.pl reflects a subpath of the host filesystem as a mount point of type fuse. Read-only and read-write mounts are both possible. All Unix filesystem operations are supported, except for the handling of POSIX extended attributes. Large files (i.e. files longer than 2GB) are not supported.
driveplugger is a removable storage manager that safely puts control into the hands of the user. It makes devices such as USB drives, CDROMs, or any other removable media easy to use. The user can assign names to devices. Browsing, ejection, and other operations can be done through a tray icon.