Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
NetTK - NetTK, Network Tool Kit, is an Open Source alternative for monitoring and troubleshooting your...
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
NetCrunch Tools - Our free network tools offer ping scanning, SNMP scanning, port and network service scanning, and more.
AUTAPF - Reliable TCP and UDP port forwarding for Windows.