Among others, the features of FileZilla include the following:

Easy to use
Supports FTP, FTP over SSL/TLS (FTPS) and SSH File Transfer Protocol (SFTP)
Cross-platform. Runs on Windows, Linux, *BSD, Mac OS X and more
IPv6 support
Available in many languages
Supports resume and transfer of large files >4GB
Tabbed user interface
Powerful Site Manager and transfer queue
Bookmarks
Drag & drop support
Configurable transfer speed limits
Filename filters
Directory comparison
Network configuration wizard
Remote file editing
Keep-alive
HTTP/1.1, SOCKS5 and FTP-Proxy support
Logging to file
Synchronized directory browsing
Remote file search