JFS for Linux
- Provides specifications, documentation and downloads for IBM's journaled file system.
- http://jfs.sourceforge.net/

Andrew Morton: Ext3 for Linux 2.4 Kernel
- Provides links to documentation, patches, downloads, tools, CVS and mailing lists.
- http://www.zip.com.au/~akpm/linux/ext3/

CryptFS
- A stackable vnode level encryption File System
- http://www.fsl.cs.sunysb.edu/docs/cryptfs/cryptfs.html

Solid File System (SolFS)
- A single-file virtual file system for Delphi (VCL), .NET, Windows, Linux, PalmOS, PocketPC.
- http://www.solfs.com/

SFS
- A networked file system which provides security over untrusted networks.
- http://www.fs.net/

ARLA
- Arla is a free AFS implementation
- http://www.stacken.kth.se/project/arla/

AFS
- Andrew File System
- http://www.cs.cmu.edu/afs/andrew.cmu.edu/usr/shadow/www/afs.html

Filesystems HOWTO
- Describes a wide variety of filesystems and instructs you on how to access them from a wide variety of operating systems.
- http://www.penguin.cz/~mhi/fs/

xFS
- Serverless Network File Service
- http://now.cs.berkeley.edu/Xfs/xfs.html

DFS
- Distributed File System
- http://cs.gmu.edu/~menasce/osbook/distfs/

FHS
- Filesystem Hierarchy Standard
- http://www.pathname.com/fhs/

Coda File System
- CMU's advanced networked File System
- http://www.coda.cs.cmu.edu/

Lustre a network clustering FS.
- An offshoot of AFS, CODA, and Ext2.
- http://www.lustre.org/