QEMU is a generic and open source machine emulator and virtualizer.

When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.

When used as a virtualizer, QEMU achieves near native performance by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, ARM, MIPS and S390 guests.

This was usually tracked under https://launchpad.net/qemu but migrates to https://gitlab.com/qemu-project/qemu in 2021.
This is a shadow-project to allow auto-tracking remote bugs from gitlab without interfering with the classic launchpad based qemu project.