Progress WS_FTP - Progress WS_FTP is a robust FTP server solution that enables you to keep an eye on transfer details and security, accelerate file transfers, and protect your data with advanced settings and controls.
AWS Transfer for SFTP - AWS Transfer for SFTP (AWS SFTP), is a fully managed service hosted in AWS that enables transfer of files over the Secure Shell (SSH) File Transfer Protocol directly in and out of Amazon S3.
CompleteFTP by EnterpriseDT - CompleteFTP is a secure FTPS and SFTP server for Windows.
IBM Sterling File Gateway - IBM Sterling File Gateway is an easy solution to transfer files with different file formats and protocols.
FTP Today - FTP Today offers private and secure file transfer/sharing via a hosted Software-as-a-Service model.
MOVEit - Secure data & file transfer for enterprise-level users