• FreeS/WAN VPN
  FreeS/WAN is an open source implementation of IPSEC & IKE for Linux VPN applications. Establishing the framework for Guardian Digital VPN Server Suite, FreeS/WAN allows the building of secure tunnels through untrusted networks. Guardian Digital utilized the resources provided by the FreeS/WAN project to develop a secure corporate VPN application suitable for enterprise use.
  
  
  
  
• PPTPD Secure Tunneling
  PPTPD (Point to Point Tunneling Protocol Daemon) is an open source application to provide secure tunneling for a VPN client. Guardian Digital Secure VPN Server implements PPTPD as an integral security component.