* [cadvisor](https://github.com/google/cadvisor) - Analyzes resource usage and performance characteristics of running containers ([Source Code](https://github.com/google/cadvisor)) `Apache``Go`
* [check_mk](http://mathias-kettner.com/check_mk.html) - Collection of extensions for Nagios.
* [Dash](https://github.com/afaqurk/linux-dash) - A low-overhead monitoring web dashboard for a GNU/Linux machine.
* [Datadog](https://github.com/DataDog/dd-agent) - Real-time monitoring, visualization, and alerting as a service \[[1](https://datadoghq.com/blog?ref=awesome)\]
* [Healthchecks](https://healthchecks.io/) - Monitoring for cron jobs, background services and scheduled tasks.
* [Icinga](https://www.icinga.org/) - Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring - ([Source Code](https://github.com/Icinga)) - `GPLv2`