Netdata - Monitor your servers, containers, and applications, in high-resolution and in real-time.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases
Terraform - Tool for building, changing, and versioning infrastructure safely and efficiently.
eZ Server Monitor - eZ Server Monitor is a script for monitoring Linux servers.
Rancher - Open Source Platform for Running a Private Container Service