NT Kernel Resources

Internet Gateway
FreeA Source-Code Solution for Internet Connection Sharing
WindowsVirtNet
FreeVirtNet: Simple Virtual Network Interface Driver
WindowsNeT Firewall
Trial versionNeT Firewall: Robust Network Protection for Windows
Windows
Local Network Monitor
Trial versionLocal Network Monitor Tracks TCP/IP Activity
Windows
Ethernet Bridge
FreeMAC Level Ethernet Bridge for TCPIP Interfaces
Windows
LAN HTTP Monitor
FreeCapture and Analyze All LAN HTTP Network Traffic
Windows