1. Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.

  2. CloudFlare can be used by anyone with a website and their own domain, regardless of your choice in platform

  3. Open-source error tracking that helps developers monitor and fix crashes in real time. Iterate continuously. Boost workflow efficiency. Improve user experience.

  4. Observium

  5. IT infrastructure monitoring & alerting

  6. Packetbeat is an Open Source Application Monitoring and Packet Tracing (Packet Sniffer) system.

  7. Beats is the platform for single-purpose data shippers that is installed as lightweight agents and send data to machines to Logstash or Elasticsearch.

  8. PRTG Network Monitor is a network monitoring and infrastructure management tool. It lets network administrators monitor devices such as access points, routers and switches. Read more about PRTG.

  9. Docker is an open platform that enables developers and system administrators to create distributed applications.

  10. Advanced, production process manager for Node.js

  11. High performance data logging and graphing system for time series data

  12. Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.