Instrumental is a real-time, high-scale application and server monitoring tool with intelligent alerts, a powerful query language, and free development accounts.
linux windows oxs free metrics commercial metrics monitoring visualization php ruby python net java nodejs
Amplify is free monitoring tool for NGINX. Amplify offers extended NGINX metric collection, visualization, monitoring, and a static analyzer for NGINX configuration. It's simple to set up, yet powerful enough to bring the much needed insight into NGINX performance. Amplify is a SaaS developed and operated by Nginx, Inc. Keep NGINX up to date and secure with a native monitoring solution.
linux bsd free commercial logging monitoring metrics visualization security hardening errors
Node-Bell is a real-time anomalies detection system for periodic time series, built to be able to monitor a large quantity of metrics. It collects metrics from clients like statsd, analyzes them with the 3-sigma rule and visualizes results on the web. Once enough anomalies were found in a short time, it alerts you via alerters like hipchat.
linux osx bsd open-source free metrics