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Oracle VM VirtualBox
Download VMware Workstation Player | VMware
What is a Virtual Machine? | VMware Glossary
What is a virtual machine (VM)? - azure.microsoft.com
Virtual machine - Wikipedia
VM VirtualBox | Virtualization | Oracle
Oracle VM VirtualBox | Oracle Technology Network | Oracle
VMware Desktop Hypervisors for Windows, Linux, and Mac
What is a virtual machine (VM)? - Red Hat
What Is a Virtual Machine (VM)? | IBM