Metalsmith - An extremely simple, pluggable static site generator.
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.
Nikola - Nikola is s static site generator tool written in Python.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Assemble - The static site generator for Node.js, Grunt.js and Yeoman
Zabbix - Track, record, alert and visualize performance and availability of IT resources