LogMeIn Hamachi
LogMeIn Hamachi is a hosted VPN service that securely connects devices and networks, extending LAN-like network connectivity to mobile users, distributed teams and business applications. You can easily create secure virtual networks on demand, across public and private networks. Hamachi is managed and maintained from anywhere via the web, securely. Hamachi is free for up to 5 computers in your network. If you run Hamachi as a service in unattended mode, you can choose from the yearly subscription packages.