Mountain Duck!

Cyberduck is an open source FTP client.

odrive is a free application that makes it easy to manage, access, and share all of your files from one place. Integration into more than 20 services, full bi-directional desktop sync, placeholder files, a robust web client, and advanced sharing capabilities.

Cloud storage as hard disk

One desktop application to manage all your cloud storage accounts and FTP connections.We support :Dropbox, Kanbox, Google Drive, Box, Skydrive, SugarSync, Amazon s3, Weibo, Twitter, VK, Facebook, Picasa, Flickr, Instagram, FTP, FTPS an SFTP...

ExpanDrive is a Network file system client for Mac OS X and Microsoft Windows that facilitates mapping of local volume to any SFTP server the user can access. It also can connect to FTP, Amazon S3, RackSpace Cloud Files, OpenStack Swift Object Storage, DreamObjects, WebDAV, Dropbox, Google Drive and Box.com. When a server is mounted with ExpanDrive any program can read, write, and manage remote files (that is, files that only exist on the server) as if they were stored locally.

CloudMounter is a handy system utility that allows mounting cloud storage accounts and file-servers as additional drives on your Mac. The way it works is really easy: choose the service to mount with the help of a handy connections manager, login using your credentials and the mounted service or server will appear as an additional drive in Mac Finder.

With DirectNet Drive you can use the remote storage as a local drive: drag-n-drop the files in Windows Explorer, watch videos and play music in your favorite media player just directly from the FTP site.

Unlike a typical file transfer client, WebDrive allows you to open and edit server-based files without the additional step of downloading the file. Using a simple wizard, you assign a network drive letter to any FTP, SFTP or WebDAV Servers. By connecting through a virtual drive, there is no need to learn a separate client interface. You access and edit files on the server the same way that you interact with files on your local PC. WebDrive can also map a drive letter to corporate SharePoint servers, as well as Amazon S3, Google Drive and DropBox. »

SFTP Net Drive lets you work with the remote file system as if it were a local disk drive, given that the remote system supports SFTP protocol.

1. A Real Drive. Creates a virtual hard drive that is indistinguishable from a real drive. Stores the actual data in the cloud provider of your choice (or locally).

CloudBerry Drive is a tool to map your cloud storage as a local drive to access and edit files in the cloud directly from the Windows Explorer interface. Supports Amazon S3, Amazon Glacier, Rackspace Cloud Files, Windows Azure, HP Cloud Storage, OpenStack Swift, Goolge Cloud Storage