DigiTunnel is a Virtual Private Network (VPN) client for Mac OS X, compatible with Windows 2000, WatchGuard, Nortel, OS X Server 1.2 and other VPN servers. DigiTunnel supports PPTP (Point-to-Point Tunneling Protocol), an Internet standard for VPN.
It allows you to make a VPN connection which is not a default gateway. This means when you are at home only traffic destined for your work network goes over VPN, your web traffic, Bittorrent, and Acquisition downloads don't.