ChipEm
Available for:
ChipEm is a Chip 8 emulator, Chip 8 was a simple virtual machine that runs a simple machine code. It ran on some videogame consoles of 70's, and was also implemented on some HP calculators on early 90's. ChipEm is multiplatform, you can download for Windows, Amiga, Mobile phones, and a JavaScript version to run it anywhere.