QEMU, Parallels Desktop, VMware Workstation Pro, Proxmox Virtual Environment, Limbo PC Emulator, Windows Sandbox, Portable Virtualbox, VMware Workstation Player, KVM (Kernel-based Virtual Machine), virt-manager, QEMU Manager, VMware Fusion, AQEMU, Multipass, Bochs, UCS Virtual Machine Manager, Boxes, PCem, MobaLiveCD, XCP-ng, JavaQemu, VMWare Disk Mount, QtEmu, 86Box, Mojopac, JPCSIM, VMLite Workstation, Qemu Simple Boot, bhyve, GreenVBox, VirtualBuddy, Veertu, xhypervisor, FAUMachine, pcemu, Virtual PC, GNURoot Debian, Parallels Workstation, VMLite XP Mode, OpenVZ, PetiteCloud, SysInfoTools Virtual Disk Machine Recovery Tool, MokaFive Player, VMX Builder, USBFastBoot are some alternatives to VirtualBox.