1)   InJoy Dialer 3
InJoy offers unattended operation, robust [24/7] connections, Firewall protection, Internet Gateway, and powerful IPSec VPN capability. It's the perfect choice for dial-up based embedded systems, mobile workers and the home-network gateway.

 2)   Radl Free Radius server 1.5
The main goal of the Radius server (Remote Authentication Dial-In User Service) is to centralize the authentication information (name, password, keys ..) attached to users. It is frequently used with Remote Access Server equipments and Dial-in users.