Six Degrees of Wikipedia - Find the shortest path between two subjects
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.
Pathica - Find a path to connect with anyone on Instagram.
Platypus - Realtime server monitoring and reporting
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services