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.
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Kauna - Kauna is a music visualizer. Kauna renders any sound reproduction in system.