Zabbix - Track, record, alert and visualize performance and availability of IT resources
Specops Deploy - Specops Deploy is the name of an advanced deployment program that simplifies the installation of the software and applications in addition to the multiple operating systems.
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.
Ansible tower - An ansible web frontend.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.