1. AWStats is a Open Source Web Analytics software written in Perl.

  2. Checkmk is comprehensive IT monitoring solution in the tradition of Nagios.

  3. Distributed tracing system released as open source by Uber

  4. SignalFx is an advanced monitoring platform for modern applications.

  5. Elasticsearch is an open source, distributed, RESTful search engine.

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

  7. Directed by Frank Coraci.

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

  9. Observium

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

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

  12. 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.