VMware vSphere is described as 'VMware virtualizes computing, from the data center to the cloud to mobile devices, to help our customers be more agile, responsive, and profitable' and is an app in the network & admin category. There are more than 25 alternatives to VMware vSphere for a variety of platforms, including Linux, Self-Hosted, Web-based, Mac and Windows apps. The best VMware vSphere alternative is VirtualBox, which is both free and Open Source. Other great apps like VMware vSphere are Proxmox Virtual Environment, OpenStack, Lima and oVirt.
It’s free and mature solution for production ( pme )