Zabbix - Track, record, alert and visualize performance and availability of IT resources
Youtube-DJ - Mix YouTube songs together
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.
Edjing - Discover edjing and edjing Pro, the most powerful DJ apps for music lovers! Mix on Android, Windows and iOS devices and record then share your DJ sets!
Prometheus - An open-source systems monitoring and alerting toolkit.
Pacemaker - Create and share mixtapes with friends