QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
A Google a Day - Online trivia game where you use Google's search to answer questions as fast as you can.
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.
Trivia Crack Kingdoms - The amazing quiz game that lets you test your knowledge and challenge your friends to see who is the smartest. Developed by Etermax
Prometheus - An open-source systems monitoring and alerting toolkit.