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.
Solaris Sky Calendar - An astronomy calendar right in your pocket
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Alpenglow - Never miss a incredible looking sunrise or sunset again