CompleteFTP by EnterpriseDT - CompleteFTP is a secure FTPS and SFTP server for Windows.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
Mega - Secure File Storage and collaboration
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.
Google Drive - Access and sync your files anywhere