FileZilla is a fast and reliable FTP client with lots of useful features and an intuitive interface.

Licence Type: Freeware

Operating Systems Support: Win XP/2003/08/Vista/Windows7

Download Link: FileZilla

Developers Homepage: FileZilla

Main Features:
- Ability to resume Uploads/Downloads (if the server supports it)
- Custom Commands - Site Manager with folders
- Keep Alive system
- Timeout detection
- Firewall support
- SOCKS4/5 and HTTP1.1 Proxy support
- SSL secured connections
- SFTP support - Upload/Download Queue
- Drag&Drop
- Multi-language support
- GSS authentication and encryption using Kerberos

New features:
*nix: Add support for forward and backward mouse buttons
Bugfixes and minor changes:
Speed limits can be re-enabled on SFTP connections
Changed settings did not come into effect unless FileZilla was restarted
Small performance improvements

There also is a server component available at the author's site.