QEMU

QEMU is a versatile open-source machine emulator and virtualizer that executes guest operating systems with near-native performance.

QEMU serves as a critical pillar for modern virtualization by providing two distinct modes: full system emulation and user-mode emulation. In system mode, it models an entire hardware environment (including CPUs, memory, and peripherals) to run guest operating systems like Linux, Windows, or macOS across diverse architectures such as x86, ARM, and RISC-V. When paired with the Kernel-based Virtual Machine (KVM) on Linux, it achieves hardware-accelerated speeds by executing guest code directly on the host processor. For developers, its user-mode capability is indispensable: it allows binaries compiled for one architecture to run seamlessly on another by translating system calls on the fly.

https://www.qemu.org/