JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
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.
netperf - Netperf is a benchmark that can be used to measure the performance of many different types of networking. It provides tests for both unidirectional throughput, and end-to-end latency. - HewlettPack...
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.