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 excels in customizability and supports various architectures, making it suitable for educational and debugging purposes. In contrast, Virtual PC offers a more user-friendly experience, optimized for running Windows operating systems with better performance and storage features, but lacks the flexibility of Bochs.