XGngeo is a GUI frontend for Gngeo, a powerful command line Neo Geo emulator. It provides a complete, pratical, and user-friendly GTK+ interface and features multiple configuration panels, an intuitive design, and the ability to regulate emulator behaviour both easily and precisely. ROM selection is made simple thanks to a full-featured list with preview images and game information.
Yet Another Machine Simulator (YAMS) is a simple yet realistic machine simulator, which is mainly aimed for teaching purposes on operating systems courses. It simulates one or more MIPS32 CPUs and I/O devices such as disks, terminals, and network cards. Additional devices can be implemented as separate programs that use its I/O plugin interface. The device properties are very configurable. High performance was not a priority factor in its implementation since the main purpose is educational, so YAMS is not an answer for people looking for a fast MIPS emulator/simulator.