Interarchy is an advanced file transfer app that supports FTP, SFTP, Webdav, S3 and the new, very fast iFTP. It also supports plug-in architecture for compressing files, running scripts and restarting servers.
It ties in well with both Amazon and Rackspace's cloud file hosting services, allowing you to transfer and manage data in the cloud. It also boasts as being the fastest file transfer client on the Mac, transferring over 80MB/sec on a gigabit network.

FavoriteFTP is a product to help you synchronize files between Mac and FTP servers. Do you still need to manually upload files you just edited? Do you still need to pickup files in different directories in order to upload them? Do you still need to check every directories in FTP server to download files your partners just updated? Please, leave it to FavoriteFTP. It detects new and changed files on Mac and FTP server, then synchronizes them automatically. All you need to do is a button click.

Mountain Duck, based on the solid open-source foundation of Cyberduck, allows you to mount remote volumes in Finder on OS X and File Explorer on Windows. Access remote files as if they were on a local disk, and edit them with your preferred applications. A minimalist user interface in the menu bar allows you to quickly mount remote volumes. Bookmarks are shared with Cyberduck if installed.

You need to transfer files. Maybe to an FTP or SFTP server, or the cloud via Amazon S3, or using WebDAV. You maintain a website, do backups, or upload photos. You need Transmit, the #1 Mac OS X FTP client.

Total Manager is an all-in-one app to manage loads of files in an efficient way. Total Manager is a powerful file manager with a classic double-window and multi-tab interface. It is not only a professional archiving app that can easily compress, extract, and preview almost all archive files such as ZIP, RAR, 7z and more, but also supports viewing images, playing audio and video files, together with basic operation such as copy, move, rename, and delete. Moreover, you can open multiple tabs and browse local directories and archives separately at the same time. In short, it's a great file manager.

Yummy FTP Watcher automates uploads and downloads, and syncs between your Mac and any number of FTP/S + SFTP + WebDAV/S servers, watching the chosen folders for changes and acting upon them. Powered by the file transfer engine of the highly regarded Yummy FTP Pro app, all the speed and reliability you'd expect is provided, as well as useful features such as filtering, bandwidth limiting and Growl notifications.

Yummy FTP Alias brings quick and easy drag-and-drop FTP to your Desktop - drag your files onto an FTP Alias icon in the Finder or Dock to upload them to your FTP/S + SFTP + WebDAV/S server!

This major new release of our immensely popular file transfer app for Mac OS X is packed with new and exciting features, and fits right into the heart of OS X with full Retina display support, Full Screen mode, localisation in 11 different languages and a significantly enhanced user interface...

ForkLift is a robust and elegant Finder replacement and FTP + SFTP + WebDAV + Amazon s3 client, fully embracing the Apple methodology of bringing incredible power to a beautiful and easy-to-use, approachable interface, it also integrates multiple features you would normally buy in many separate applications. Batch Rename, App Deleter, Archive creation & management, powerful Folder Sync, and the ability to Split and Combine large files are all at your fingertips.

Cyberduck is an FTP, SFTP, WebDAV, S3 & OpenStack Swift browser to transfer files to your web hosting service provider and connecting to cloud storage accounts from Rackspace Cloud Files, Google Storage and Amazon S3 with the same easy to use interface with quickly accessible bookmarks. The browser allows to download, upload and move or copy files using drag and drop with an hierarchical view to browse large folder structures efficiently. Transfers are handled with ease including synchronization of local with remote directories. To edit files, a seamless integration with any external editor application makes it easy to change content quickly. Both Amazon CloudFront and Akamai content delivery networks (CDN) can be easily configured to distribute your files worldwide from edge locations.