UTM is described as 'full featured system emulator and virtual machine host for iOS and macOS. It is based off of QEMU. In short, it allows you to run Windows, Linux, and more on your Mac, iPhone, and iPad' and is a Virtualization Tool in the Network & Admin category. There are more than 50 alternatives to UTM for a variety of platforms, including Windows, Linux, Mac, BSD and Online / Web-based. The best alternative is VirtualBox, which is both free and Open Source. Other great apps like UTM are QEMU (Free, Open Source), VMware Workstation Pro (Paid), KVM (Kernel-based Virtual Machine) (Free, Open Source) and VMware Workstation Player (Free Personal).
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.
VMware Workstation Player builds on the industry leading foundation of Workstation Pro, and delivers a streamlined user interface for creating and running operating systems and applications in a virtual machine.
Parallels Desktop gives Mac users the ability to run Windows, Linux or any other operating system and their critical applications at the same time as macOS. Parallels Desktop is optimized for Intel and Apple M1 chip.
Xen.org, home of the Xen hypervisor, the powerful open source industry standard for virtualization. It is a native (bare-metal) hypervisor providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently.