WinSCP Portable supports a variety of transfer protocols, so you can use one tool for both secure and insecure file copying. It is a free and open source file transferring application that's light on system resources, portable, well-designed and powerful.
Here are some screenshots to illustrate the features and user interface of this application:
And open-source FTP, SFTP and SCP client that use to transfer files between a local and remote computer. Screenshot of WinSCP Portable - 1064px · 715px