File Systems

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/

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

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

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

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

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/

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

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

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

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/

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