Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
NetTK - NetTK, Network Tool Kit, is an Open Source alternative for monitoring and troubleshooting your...
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.