MFT Gateway is described as 'The simplest, most economical, most scalable B2B/EDI Managed File Transfer service in the cloud!' and is an app in the File Sharing category. There are four alternatives to MFT Gateway for Linux, Windows, Mac, OpenPGP and Solaris. The best alternative is FileXpress. It's not free, so if you're looking for a free alternative, you could try GoAnywhere MFT. Other great apps like MFT Gateway are SFTPPlus (Paid) and yamiMFTX Server (Paid).
GoAnywhere is a robust managed file transfer solution that helps companies streamline, automate, and secure file transfers to protect the sensitive data so critical to staying competitive in today's global economy.
yamiMFTX Server is a self-hosted solution for managed file transfer and file sharing on an ad hoc basis. It allows easily upload files via any modern browser, share and download files with your colleges, partners and customers.