Serv-U

"Serv-U FTP server includes web, SFTP & FTPS file transfer. OS: Windows or Linux."
Serv-U FTP server is an advanced and secure file server for a remarkable price.

Supported Protocols:
FTP, SFTP (SSH) and FTPS (SSL/TLS).
Web browser transfers via HTTP/S (including multiple, large files w/ drag and drop).
Mobile device transfers via HTTP/S (iPad, iPhone, Kindle Fire, BlackBerry, Android, etc.).
IPv4 and IPv6.

Supported Operating Systems:
Windows: Server 2008, Server 2003, Windows 7, Vista, XP - both 32- and 64-bit editions.
Linux: Red Hat (RHEL), Ubuntu, Fedora, CentOS, SUSE and several more - both 32- and 64-bit editions.

Major Features:
Event-driven automation (send email, run program, move file, etc.).
Brandable interface (your logo, your theme, etc.).
Web-based remote administration.
Virtual folders permit use with local storage and remote shares - simultaneously.
Multiple authentication sources (Active Directory, database, custom).
Granular control over bandwidth, storage, permissions and access.
Automatic account maintenance (reset password, disable after X days, etc.).
Multi-factor authentication.
Advanced web clients support drag-and-drop, thumbnails, synchronization, two-panel transfers and more.
Native English, German, French, Chinese, Japanese, Russian, Swedish, Spanish, Finnish, Norwegian, Danish and Portuguese interfaces.

Popularity:
Used by 9 of the Fortune 10 to secure file transfers with employees and business partners.
Used by more than 100,000 businesses worldwide.
The top-selling commercial FTP server in most countries.

Support:
Purchase includes free email support and available live phone support to our U.S.-based office.
Unattended ("silent") installation options available for IT professionals.
FIPS 140-2 and U.S. Army Certificate of Networthiness validated.
Each server supports 100's of GBs per day and 1000's of users.

See also:
FTP Voyager FTP client
http://www.RhinoSoft.com