A terminal emulator for text-based access to the IPFire located on Mac at: Applications > Utilities > Terminal.app
Provides secure file transfer capabilities
An open source client (free / donation-ware) for SFTP located at https://cyberduck.io
Cyberduck is a server and storage browser for Mac (and Windows) with support for FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox.
A SFTP client located at http://rsug.itd.umich.edu/software/fugu/
Fugu, last updated in 2011, is a graphical frontend to the commandline Secure File Transfer application (SFTP). With Fugu you are able to create and organize SCP-, SFTP- and SSH-Connections with this graphical interface. Unfortunately Fugu does not support TextEdit, the Mac-integrated editor, but a really good and free one that Fugu supports is Smultron.
Provides secure road warrior to IPFire device connections
An open source graphic user interface for OpenVPN located at https://tunnelblick.net. It provides easy control of OpenVPN client and/or server connections.