FileZilla is an open-source success story. It's an FTP client that's attractive, reliable, regularly updated and a very good example of it's type. If you're looking for a file transfer solution, it should be the first program you check out.
In fact, FileZilla isn't just limited to FTP - it also handles FTPS and SFTP for secure transfers of multiple files on multiple servers. The interface gives you a quick outlook of all your transfers, sites and disks and makes it easy to drag and transfer. The QuickConnect button - which lets you access your favorite server in seconds - is a great feature.
FileZilla is fairly fast, and can resume downloads and handle very big transfers, higher than 4GB. You can set both local and remote filters for things like images, explorer files or CVS and SVN directories or even create your own. FileZilla also includes a tool to compare directories in terms of file size or modification time.
The application can guide you when setting up your network and lets you set speed limits in case you don't want to overload your bandwidth. One thing really missing from FileZilla though is a scheduler to automatically set transfer times.
With the odds stacked high in its favor, FileZilla is a truly excellent open source FTP client.
