Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
Multiping - Get MultiPing Support. Network monitoring in 60 seconds. MultiPing provides a graphical view of network performance, monitors hundreds of targets, and sends automatic alerts..
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
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.
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.