FTCrypt!

Cyberduck is an open source FTP client.

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.

"Dual pane file manager and SFTP/FTP client for Mac OS XForkLift is designed to be the fastest, most powerful file manager for the Mac. Connect to FTP or SFTP servers, manage your Amazon S3 account or your mobile devices over Bluetooth. All these features are beautifully integrated into a sophisticated, yet easy to use Cocoa based interface. Dual-pane view will dramatically increase your productivity along with state-of-the-art features like live preview, spring loaded folders and any-to-any workflow. All this to be topped by tabs, to keep your workspace nice and clean." »

Brings features from Sublime Text to the file manager niche.

Yummy FTP Pro is an FTP/S + SFTP + WebDAV/S file transfer client which focuses on speed, reliability and productivity.

Cute FTP is an utility for transferring files between your computer and a remote File Transfer Protocol (FTP) server anywhere on the Internet.

Free and portable FTP- and WebDAV-client software with support for FTP/S, SFTP and WebDAV/S protocols

Useful and reliable Mac FTP client. Viper FTP is a handy and powerful file manager for macOS, with a tremendous user interface that makes it effortless to use.

Skod is a (File|Transfer|Protocol) client for humans, easy to use and hackable. Written in pure C, without any external library.

CrossFTP is a free FTP, Amazon S3, Amazon Glacier, and cloud storage client.* CrossFTPs main features: Multi-tab Navigation; Unicode support; Bonjour Service Discovery; Archive browsing(.zip,.tar.gz,etc.); Auto-reconnecting and anti-idle; and more.* CrossFTP Pro version is available by a license fee, which further features: Mutli-Thread transfer; Synchronization; WebDav, SFTP, FTPS, Advanced Amazon S3/Glacier support; CouldFront and URL sign support; Remote file edit; FXP; and much more.

Captain FTP is specifically designed and built for Mac OS X. It combines powerful FTP transfer capability with user friendly functionality, in an attractive metal interface.

DriveMaker Freeware mounts or maps an FTP site to your desktop or Windows Server as a drive letter, for example: D:. Now you can use all kinds of different software to access the files on your FTP server just like the files you have on your PC, including the command prompt, anti-virus, Microsoft Excel, Word, etc.