ExpanDrive acts just like a USB drive plugged into your Mac. Open, edit, and save files to remote computers from within your favorite programs—even when they are on a server half a world away. ExpanDrive enhances every single application on your computer by transparently connecting it to remote data.
With ExpanDrive, you can securely access any remote file server directly from Finder, or even the terminal. No need to open a separate transfer client just for file transfer. ExpanDrive extends the way all applications on your Mac can access data.

What's new
Version 2.1.1:
NEWStrongspace drive type for easy connection to ExpanDrive's upcoming Strongspace online storage service.
NEW All-new high-speed Amazon S3 connection engine that will drastically performance during transfers and while browsing.
NEWImprovements to ACL handling with S3 - Access-control policies on existing files are now preserved through modifications, including renames.
NEW Sequential polling in large directory structures to improve browsing performance in large trees
NEW S3 Files now have an r/w extended attribute named "com.expandrive.s3fs.ContentType" allowing access to set MIME-Type.
NEW Symbolic links are now emulated. When viewed in earlier versions of ExpanDrive, these will appear as empty directories; when viewed in other S3 browsers, they will appear as keys containing the link target.
NEW [Experimental] If a file has not been assigned a MIME content type, then when it is written back to S3, a content-type is inferred from the file's contents and its filename. The result can be overridden using the extended attribute.
NEW [Experimental] Experimental support for inheritable S3 ACLs on directory keys.
CHANGED Improved stability against temporary network errors
CHANGED Increased timeout for connection and slow operations
CHANGED Updated logging interface
CHANGED Updated to use Python 2.6.5 internally
CHANGED Updates to German, Dutch and Lithuanian localizations
CHANGED More robust handling of FTP servers with broken SSL implementations.
FIXED Fixed issue where ExpanDrive would occasionally not notice unmounted drives.
FIXED Fixed issue where ExpanDrive would not correctly clean-up its mount point.
FIXED Fixed a rare issue which could cause a stall launching ExpanDrive on Snow Leopard
FIXED Fixed a rare issue that could prevent a password from correctly being saved
FIXED Fixed an issue that could prevent automatic updates from being noticed
FIXED Several fixes to the FTP directory-listing parser.

System requirements:
Mac Platform: UB
OS version: 10.4

Link for more information: _http://www.expandrive.com/mac