VirtualBox

Oracle VirtualBox is a cross-platform virtualization application that runs multiple operating systems in virtual machines (VMs) alongside your existing applications. You can run as many VMs as you like, limited in practice by disk space and memory, and save snapshots to revert to or branch from. Guest Additions add shared folders and clipboard sharing. The base package is open source under the GNU General Public License V3, and the optional, separately licensed Extension Pack adds a VRDP server, AES disk encryption, and cloud integration for Oracle Cloud Infrastructure.