Adit

Adit is a free remote access solution that allows connections to remote computers without any port forwarding or firewall changes. The firewall and NAT traversal is accomplished by routing communication between two clients through a server that you host yourself. The server, client, and viewer components are all included in this one application. Key Features: Remotely control computers without forwarding ports; Unattended access via an installable Windows service; File transfer and clipboard sharing.