Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.