Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
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.
Talalarmo - Minimalistic android alarm
Prometheus - An open-source systems monitoring and alerting toolkit.