Free FTP Client
Free FTP Client is the best secure way to send or retrieve files from our FTP server
FireFTP
If you use firefox, or if you needed one more reason to consider switching, the top pick is FireFTP. After the latest round of upgrades it now support SFTP, compression, and while somewhat hidden even FXP (server to server transfer). Other advanced features include directory comparison, syncing directories while navigating, SSL encryption, search/filtering, integrity checks, remote editing, drag & drop, file hashing, and more. With this feature set, its ease of use, and browser integration FireFTP should now serve the needs of all but the heaviest power user needs and is quickly becoming one of favorite FTP clients.
Cyberduck
One of the main players in the FTP game is Cyberduck – a free, open-source application that is quite possibly the best solution currently available on Mac. It can connect to FTP, SFTP, WebDav, Cloud Files, Google Docs and Amazon S3. Cyberduck is written by David V. Kocher however as mentioned before, it’s an open-source software, so the application is constantly improved by many people around the world. Cyberduck is an excellent free file browser for the Mac. It stacks up well against its paid competitors and is filled with many great features. It’s a very easy program to use and feels polished.
FileZilla
It is the darling of the OSS crowd and certainly does the job. Some users report that WS_FTP Pro (the commercial program) has lately become far too bloated, and instead they have turned to one of the capable and lightweight freeware applications. It is a very credible alternative to WS_FTP and has most of the features. It uses a simple layout based on a two-pane interface that looks a bit like the early versions of WS_FTP. But this simplicity is deceptive, it is actually quite a powerful product. There's a full-featured site manager, firewall and proxy support, SFTP, SSL and Kerberos GSS security, restart, drag 'n drop and a lot more. The only significant feature that's missing is site-to-site transfer, but that's probably of no importance to most users. What is of importance is that FileZilla is totally reliable and very easy to use. The new V3 of FileZilla adds support for Linux, Mac OS X and FreeBSD.
Tunnelier
Tunnelier is reported by a contributor as a much better proposition than FileZilla for SFTP. It's a fast SSH client with a basic FTP client strapped on. The main reason for using it is that over SFTP it's many times quicker than FileZilla, which is vital when you are sending 200mb video files.
WinSCP
WinSCP will suit if you want a SCP (secure copy) client for Windows that uses SSH and offers a rich feature set. It includes a built-in terminal, it can launch Putty directly, allows remote file editing, direct transfer and transfer queuing, and has the ability to limit download speed rates.
CoreFTP LE
This is the Lite version of the commercial product; it has an annoying nag screen on start-up, though, that might put you off. CoreFTP could be the one for you if you need to log on to a site that gives problems, and it also has a massive feature set. Its strength is probably the ease of use for such a powerful app.
CoreFTP has four particular strengths:
1. It has the best tricky-site access ability of any FTP client I've used.
2. It has an excellent GUI that makes it outstandingly easy to use.
3. It has a massive feature set that somehow doesn't slow it down.
4. It has good on-screen real-time logging, which not all clients have.
Here is a feature list: HIPAA compliance, SFTP/ SSH, SSL/ TLS, FTP/ HTTP/ SOCKS proxy, IDN, drag 'n drop, site manager, session manager, queue manager, custom screens, bandwidthcontrol, caching, auto-transfer, retry/resume, auto-reconnect options, auto S/key, remote file-searching, advanced directory listings, start/stop/resume of transfers, full recursive chmod, browser integration, site to site transfers, file viewing and editing, firewall support, custom commands, FTP URL parsing, command line transfers, filters. This should be enough for most people. If not, upgrade to the $25 Pro version that that has custom sounds, two-way encryption, ping and traceroute, and more.
Core also do a useful-looking Micro FTP Server which can be installed on PCs and used for PC-to-PC transfers.