FileZilla is a fast and reliable FTP client, including secure options SFTP and TLS. The program interface includes an easy-to-use tabbed window, drag-and-drop capability, bookmarks, remote and recursive file search, remote file editing and a managable upload/download queue. Internally, it supports connection throttling, keepalive, timeout detection, IPv6, SOCKS 4/5 and HTTP 1.1 proxy etc.
Cross-platform with clients available for Mac and Linux. For Windows XP, an older and unsupported version is available.