1)   Bucket Explorer for Amazon S3 2007.12
Bucket Explorer is a User Interface for Amazon's Simple Storage Service, S3. Amazon S3 provides "pay only for what you use" secure on-line data storage service. You can use Bucket Explorer as a simple FTP tool or a backup tool for Amazon S3.

 2)   WebDrive 8.0
WebDrive integrates FTP, FTPS, WebDAV, SFTP, Amazon S3 or FrontPage servers into the Windows desktop by mapping a network drive letter to a server. This allows you to use your favorite applications to edit files and save them directly to the server.

 3)   UpRight 1.2
Upload your web site to a FTP server, publish files on Amazon S3, or move or copy files that match a wildcard or regular expression with a single click.

 4)   Sync2S3 1.1.5
Sync2S3 synchronizes your files with the Amazon Simple Storage Service (S3), providing you with a secure and affordable backup solution.