Fugu

Fugu is a graphical frontend for the text-based Secure File Transfer Protocol (SFTP) client that ships with Mac OS X. SFTP is similar to FTP, but the entire session is encrypted, meaning nothing, including passwords, is sent in the clear. Fugu provides a friendly, intuitive interface for OpenSSH's SFTP client, featuring secure drag-and-drop file transfers, remote file editing and remote file preview. Fugu allows you to take advantage of SFTP's strong encryption without having to sacrifice ease of use. Additionally, Fugu can make secure file transfers using Secure Copy (SCP) and can create SSH tunnels to facilitate secure interaction between machines.

Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.