Hamachi

With Hamachi you can organize two or more computers with an Internet connection into their own virtual network for direct secure communication. Access computers remotely, use Windows File Sharing, play LAN games, run private Web or FTP servers or communicate directly. Hamachi is fast, secure and simple. It is also free. Think - LAN over the Internet. Think - Zero-configuration VPN. Think - Secure peer-to-peer.
LogMeIn Hamachi is a VPN service that easily sets up in 10 minutes, and enables secure remote access to your business network, anywhere there's an Internet connection.
It works with your existing firewall, and requires no additional configuration. Hamachi is the first networking application to deliver an unprecedented level of direct peer-to-peer connectivity. It is simple, secure, and cost-effective.

Features:
>Network Limits
>Chat
>Network Protection
>Network Administration
>Extended Connectivity

Chat with all online network members at once in a single chat window.Require anyone attempting to join your network to present a valid network password.Assign one or more network members to be network administrators, and designate their specific capabilities.Note: High-Bandwidth Relays are only available for Evaluation or Commercial use.

Simple to install. Create an username and add a lot of computers in a virtual network. Have a lot of options.