Major features: transfer resume, automatic reconnect, secure authentication, extensive firewall and proxy support, support for many server types, built-in FTP search, mirroring, preserving timestamps and access rights, control connection history, downloading invisible files, mouse support, highly customizable interface, compehensive progress indicator, editing files on remote server, computing size of the subtree on server, built-in file viewer, bookmark system with folders, full site/directory history, one-key login to URL in clipboard, scripting capabilities, password caching, logging, can run in the background (Unix), displaying/storing file descriptions.