Zabbix - Track, record, alert and visualize performance and availability of IT resources
ImageOptim - Faster web pages and apps.
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.
Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications
Prometheus - An open-source systems monitoring and alerting toolkit.
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...