Assemble - The static site generator for Node.js, Grunt.js and Yeoman
Zabbix - Track, record, alert and visualize performance and availability of IT resources
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.
Wintersmith - Flexible, minimalistic, multi-platform static site generator built on top of node.js
Prometheus - An open-source systems monitoring and alerting toolkit.