vSphere - Get started with VMware vSphere editions, the world’s leading server virtualization platform and the best foundation for your apps, your cloud, and your business.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Proxmox VE - Proxmox is an open-source server virtualization management solution that offers the ability to manage virtual server technology with the Linux OpenVZ and KVM technology.
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.
Azure Virtual Machines - Build Linux and Windows virtual machines (VMs) and save up to 80 percent with Azure Reserved Virtual Machine Instances and Azure Hybrid Benefit for Windows Server.
Prometheus - An open-source systems monitoring and alerting toolkit.