rsync
- Fast incremental file transfer over its own protocol or other transports (usually used with SSH for secure transfers).
- http://rsync.samba.org/

NFS Client/Server by XLink Technology Inc.
- Windows NT/98/95 to UNIX connectivity solution. Product include Omni-NFS Enterprise, Omni-NFS Server, Omni-X-Server, Omni-Print lpt/lpr, Omni-VT420 Terminal Emulation.
- http://www.xlink.com/

Solstice NFS Client
- High-performance NFS file sharing and disk caching.
- http://www.sun.com/software/solstice/netclient/nfs-client.html

arla
- a free implementation of an AFS client
- http://www.stacken.kth.se/project/arla/

rdist
- RDist is a program to maintain identical copies of files over multiple hosts.
- http://www.MagniComp.com/rdist/rdist.shtml

Omniplex NFS
- for Windows 95/NT
- http://www.omniplex.ltd.uk/

vVault.com
- Offers remote access to shared or private files, one-step digitization of paper files, and wireless printing to any fax machine.
- http://www.vvault.com/

@Backup.com
- Automatic online system backs up and protects your files everyday. Provides easy access to files via the "File Selection Wizard".
- http://www.atbackup.com

Mobiliti Inc
- software designed to increase the productivity of the remote computer user.
- http://www.mobiliti.com

smbfs
- linux kernel module enables mounting SMB partitions
- http://www.kki.org/linux-lan