tunnelblick

tunnelblick is an application for your Mac that allows you to configure and manage VPN sessions. You can use this e.g. if you are connecting to tilde.club via a network that does not allow high UDP ports; with a properly configured tunnel, you can still run mosh as your shell and keep on truckin.

https://code.google.com/p/tunnelblick/

To find a VPN endpoint, see the VPN Gate project.