KaraFun - KaraFun is the best online karaoke. Over 35,000 karaoke songs, with studio quality, at home or on the go. Regular updates. Free demo!
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Yokee - Karaoke to YouTube videos
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.
Sing! Karaoke by Smule - Karaoke with your favorite celebrity singers
Prometheus - An open-source systems monitoring and alerting toolkit.