WinSCP is described as 'A versatile client for SFTP, FTP, and other protocols for file transfer. It offers GUI choice, and supports automation and key authentication' and is a leading File Manager in the backup & sync category. There are more than 50 alternatives to WinSCP for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best WinSCP alternative is FileZilla, which is both free and Open Source. Other great apps like WinSCP are Cyberduck, Transmit, muCommander and ForkLift.
Open-source FTP solution offering FTP, FTPS, and SFTP support. FileZilla Pro expands protocol options to WebDAV, Amazon S3, and more with FileZilla Server for comprehensive file management.
A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Transmit is a fast and wonderful file transfer app. It supports every major cloud storage provider, and it looks awfully nice.
muCommander is a lightweight, cross-platform file manager with a dual-pane interface. It runs on any operating system with Java support (Mac OS X, Windows, Linux, *BSD, Solaris...).
The most advanced dual pane file manager and file transfer client for macOS.
CarotDAV is a Simple WebDAV / FTP / SkyDrive / DropBox / GoogleDrive / Box / SugarSync client for Windows OS, available free of charge. It is also able to read GoogleDocs or IMAP.
gFTP is a simple GTK+ based ftp client for Linux. Supports the FTP, FTPS (control connection only), HTTP, HTTPS, SSH and FSP protocols, FTP and HTTP proxy server support, supports FXP file transfers (transferring files between 2 remote servers via FTP), UNIX, EPLF, Novell...
SmartFTP is an FTP (File Transfer Protocol), FTPS, SFTP, WebDAV, S3, Google Drive, OneDrive, SSH, Terminal client. It allows you to transfer files between your local computer and a server on the Internet.
FTP Rush is a powerful FTP/FXP/SFTP/TFTP client sofware for Windows 2000/XP/2003/Vista/Win7. It is designed to fit any transfer need and allows you to quickly upload or download files in all directions: from FTP Server to Local, Local to Server or Server to Server.
Royal TS provides easy and secure access to your remote systems
Unlock the power to remotely manage your systems on multiple platforms!
Royal TS is the perfect tool for server admins, system engineers, developers and IT focused information workers who constantly need to access.
Graphical SFTP client and terminal emulator with helpful utilities.
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Contrary to many of the comments here, Filezilla does support SFTP. Both SFTP and SCP are SSH-based file transfer protocols and usually when you can use one, you can use both. SCP doesn't allow browsing the filesystem, it's transfer only, so WinSCP is actually using a hacky workaround: https://winscp.net/eng/docs/requirements#scp
I prefer WinSCP, personally, but Filezilla is a perfectly good alternative.