iPerf3 - iPerf3 is a simple tool that measures Internet bandwidth.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
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...
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.
TamoSoft Throughput Test - TamoSoft Throughput Test is a utility for testing the performance of a wireless or wired network.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.