...Turm can run from any LAMP system, (Linux Apache MySql PHP), and control any SSH-accessible client. Unix/Linux, Os X, and possibly even Windows via freeSSHd.
Lomalarga is a VPN-like service based on SSH and Linux.
Lomalarga is a port forwarding (VPN-like) service based on SSH & Linux. Based entirely on open source. The client is written in C# and the administration is based on Linux/lighttpd/PostgreSQL/PHP, with the UI written with Google Web Toolkit.