Bochs (box) is a portable IA-32 and x86-64 IBM PC compatible emulator and debugger mostly written in C++ and distributed as free software under the GNU Lesser General Public License. Developed by http://bochs.sourceforge.net/
License: Open Source
Bochs is an open-source emulator that provides extensive customization and supports various CPU architectures, making it ideal for developers and testers. In contrast, VirtualBox is a more user-friendly virtualization software that supports a wider range of guest operating systems and offers robust features like snapshots and cloning.