VirtualBox, Kubernetes, Windows Sandbox, Parallels Desktop, Vagrant, QEMU Manager, Xen Orchestra, AQEMU, Multipass, UCS Virtual Machine Manager, Deis, Boxes, oVirt, JavaQemu, Apache Mesos, QtEmu, VirtualBuddy, Kimchi, Virtual PC, Cycle.io, Panamax, SysInfoTools Virtual Disk Machine Recovery Tool are some alternatives to Virt-manager.