The GNU MIX Development Kit (GNU MDK) is a free software package for developing, running and debugging programs written in MIXAL, an assembly-like language for programming a hypothetical computer called MIX. GNU MDK is part of the GNU Project. The MDK package consists of the following programs: * mixasm (MIXAL assembler and debugger) * mixvm (CLI based emulator) * mixvm.el (Emacs Lisp mixvm) * mixal-mode.el (Emacs mode for mixal) * gmixvm (GTK+ GUI for mixvm) * mixguile (Guile shell)