Zabbix - Track, record, alert and visualize performance and availability of IT resources
Get Assigned - Assign anything to anyone without complicated onboarding.
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.
Planet Quest - Planet Quest is a Rhythm, Music, and Single-player video game offered by OutofTheBit for Mobile Devices.
Prometheus - An open-source systems monitoring and alerting toolkit.
Frets on Fire - Bonus content.