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.
Reactive Search - UI components for building Amazon / Yelp like Search
Platypus - Realtime server monitoring and reporting
Searchkit - UI components for Elasticsearch
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Searchbase - Build Search UIs with drag and drop