Super User Vmware 1868
In the IT world, apart from strategic design, you have to get your hands dirty. Unfortunately it's not always easy to test everything at work, even if you have a staging environment. The best thing to do before testing on production is to test at home! VMware often comes to the rescue. Either you are on Windows , Linux on MAC, VMWare can be installed so as to virtualize everything. VMware workstation is an " industry standard for running multiple operating systems as virtual machines on a single Windows, Linux PC". For MAC users the product is VMWare Fusion. It's a hypervisor or virtual machine monitor, that creates and runs virtual machines 1 . At first i have to say that you can do the same things, more or less with the free Oracle Virtual Box. For me VMWare is a more mature software, a leader in it's field and with way better feature-set and GUI.
Super User Proxmox 998
Apart from IT (dev)ops stuff, I also am a fan of home automation. While juggling arounf several youtube and discord channels I learned about Proxmox VE. VE stands for virtualization environment. In Distrowatch.com, Proxmox is described as: Proxmox is a commercial company offering specialised products based on Debian GNU/Linux, notably Proxmox Virtual Environment and Proxmox Mail Gateway. Proxmox Virtual Environment is an open-source virtualisation platform for running virtual appliances and virtual machines. Proxmox Mail Gateway is a mail gateway with anti-spam and anti-virus features. The products are offered as free downloads with paid-for support and subscription options. So Proxmox is the company that creates a virtualization hypervisor and a mail gateway. They offer the free version of their Debian based distro with GNU AGPL, v3 license. This is a hypervisor with lots of bells and whistles and a very good web GUI.