Tagsistant
- Tagsistant is a semantic filesystem for Linux/BSD kernels allows file management using tags. Files can be placed in directories which are tags and later retrieved with a query/path like: tag1/AND/tag2/OR/tag1/AND/tag3
- http://home.gna.org/tagfs/

Magma
- A distributed hash table network filesystem for Linux that is able to scale on many nodes across the network providing instant routing of objects in a deterministic way.
- http://home.gna.org/magma/

UFS Explorer
- Data Access, File Recovery, RAID Recovery software for most Windows, Linux, MacOS file systems (FAT / NTFS / Ext2 / Ext3 / ReiserFS / XFS / UFS / UFS2 / HFS / HFS+).
- http://www.sysdevsoftware.com/soft/ufsexplorer.php

recovery data software
- URGENTRECOVERY for Windows is a safe and affordable do-it-yourself data recovery solution that is designed to recover lost and deleted files from all.
- http://www.urgentrecovery.com

Stealth Folder Hide XP
- Hide any Folder and File on your PC. Stealth Folder Hide XP includes Clear Tracks utility and File Eradicator.
- http://www.folder-hider-stealth.com

Ext2Read
- Ext2Read is a DOS utility to view and copy Ext2/Ext3 files and folders. [DOS, Windows 95/98/Me]
- http://ext2read.sourceforge.net

DiskInternals NTFS Reader
- Provides read access to NTFS disks from Windows 95, 98 and Me.
- http://diskinternals.com/products/ntfs-reader/

Stealth Storage
- Powerful feature-rich file storage system. Strong encryption can be used to protect personal data.
- http://www.stealth-storage.com

HFS Utilities
- Hierarchical File System is the native volume format used on modern Macintosh computers. Hfsutils is a comprehensive software package being developed to permit manipulation of HFS volumes from UNIX and other systems.
- http://www.mars.org/home/rob/proj/hfs/

DataPlow SAN File System Software
- The DataPlow storage area network (SAN) file system software support multiple platforms and network configurations.
- http://www.dataplow.com/

Mtools
- A collection of utilities to access MS-DOS disks from Unix without mounting them. Supports Win'95 style long file names, OS/2 Xdf disks and 2m disks. With source code.
- http://mtools.linux.lu/index.html

Bo Branten Projects
- Open Source WindowsNT and Linux file system software. Ntifs.h, Ext2fs_Rec NT Ext2 file system recognizer, SwapFs NT driver to use Linux swap partition, FileDisk is a virtual disk driver for NT that uses files to emulate physical disks.
- http://www.acc.umu.se/~bosse/