Nagios
Zabbix
Datadog
NewRelic
Paessler PRTG
Splunk
Prometheus
Spiceworks
CodeKit
Node.js
Ruby on Rails
ImageOptim
Django
Laravel
Meteor
ASP.NET
Nagios
CodeKitZabbix - Track, record, alert and visualize performance and availability of IT resources
Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications
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.
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
NewRelic - New Relic is a Software Analytics company that makes sense of billions of metrics across millions of apps. We help the people who build modern software understand the stories their data is trying to tell them.
ImageOptim - Faster web pages and apps.