Gladinet!

Cyberduck is an open source FTP client.

Duplicati is the only portable backup program, able to send backups in encrypted form to another computer or SkyDrive using one of several methods (WebDAV, FTP, SFTP/SCP/SSH, Amazon S3, Rackspace CloudFiles, USB disk, Windows network share). Time scheduler e.g. for auto-backups every 3rd Monday on 10 a.m.German, Danish, English, French, Portugese. Can also be startet from command-line. Support for snapshots via VSS and LVM: Backup of open files. Duplicati is a rewrite of Duplicity/ftplicity, written for Windows (in managed C# .NET). It also runs on Linux using the Mono framework.The lastest portable version in all 5 languages can be downloaded as a zip file from https://github.com/duplicati/duplicati/releases »

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.

GoodSync is the high-end professional easy and reliable file backup and file synchronization software.

SparkleShare is a Free Open Source syncing tool. Its light, secure and easy to use. SparkleShare allows you to setup your own servers so you always keep control on your data.

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...

Insync is a Google Drive sync and backup client with multiple account support.

The only automated sync, back-up, collaboration and file management service powerful enough for a business user and easy enough for a novice. Secure, anywhere access to your files.

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.

CarotDAV is a Simple WebDAV / FTP / SkyDrive / DropBox / GoogleDrive / Box / SugarSync client for Windows OS, available free of charge. It is also able to read GoogleDocs or IMAP.

The SME Enterprise File Share and Sync Solution provides a comprehensive control and management solution to enable secure cloud collaboration across data points for corporations.

Get 5 GB of full featured Online Backup for free. Features include Automatic Backup, True Archiving, Versioning, Continuous Backup, Mapped Drive Backup and Web-based Backup Management.IDriveSync syncs files online across multiple PCs and Macs. On installing and logging into the application, it opens up a 'Sync' area where you can add the files you wish to sync.With iDrive Sync you can Sync up to 5 computers: Once you have new data into your Sync area, your Sync data starts getting transferred online, or 'Syncs-Up'. This essentially serves as an online backup of your data. Now, if you simply install and login on multiple PCs / Macs using same authentication, the synced data is 'Synced-Down' onto those multiple computers.Anytime you make a change to synced data anywhere on those multiple computers, all the computers will shortly reflect the modified data. »

Otixo connects your favorite services (like Dropbox, Box, Google Docs, MobileMe, FTP, etc.) so that you can access all your online files in once place.