TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Warlight - Warzone is a customizable Risk-like strategy game where you compete with your friends to conquer the world.
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.
Domination - Domination is a game that is a bit like the well known board game of Risk.
Prometheus - An open-source systems monitoring and alerting toolkit.