NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Storagepipe - Automating archiving older emails
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.
vSphere Hypervisor - Get a free vSphere Hypervisor by VMware to consolidate your applications and virtualize your servers. Learn how to optimize your server’s performance
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.