Zabbix - Track, record, alert and visualize performance and availability of IT resources
Astra by Cesbo - Talk to Alexa anywhere, from your iPhone
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.
Reverb - Use Alexa on your Mac, iPhone and Android
Prometheus - An open-source systems monitoring and alerting toolkit.
Camping.care - Camping.