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KeyCDN Tools - Website speed test, online curl, ping tool, https/2 and other services
ipcalc - IP Calculator. ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets....
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
Radmin - With Radmin, provide instant remote tech support to corporate network users. Gain secure remote access to network computers and servers.
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.
whatmask - Whatmask is a small C program that will help you with network settings and subnet calculations.