On Linux you can use the built-in sftp command, a desktop client like FileZilla, or a browser-based SFTP client. A browser client is handy on servers and desktops where you don't want to install a GUI application.
Every Linux distribution includes the sftp command from OpenSSH. FileZilla provides a graphical option. WinSCP is Windows-only and not an option on Linux.
FlowSetu's online SFTP client works in any browser on Linux, giving you a full graphical file browser without installing packages.
You can try all of this without installing anything using FlowSetu's free online SFTP client.
Try the free online SFTP client — connect to any SFTP server from your browser, no install required.