Snes9x is a great freeware video game emulator for North American Super Nintendo Entertainment System (SNES)/Japanese Super Famicom (SFC), and it's the only SNES emulator available for Mac OS X system. And I think it's also the best one for Windows users.

Generally we refer to "16-bit editor" as "hexadecimal editor", said in this way everyone shoud understand what it is used for (often used for modifying software and game programs). Hex-Ed is a ultra-tiny (even smaller than "HEdit") and powerful hexadecimal editor, though not so strong as UE (UltraEdit), but it is free and portable.