GNU MDK stands for MIX Development Kit. It allows you to develop, run and debug programs written in the MIXAL programming language. MIXAL is an assembler-like language for programming a virtual computer called MIX. They were created by Donald Knuth in the first volume of `The Art of Computer Programming' (Addison Wesley, 1997).
GNU MDK was written by Jose Antonio Ortega Ruiz and is released under the GNU General Public license, so that users are free to share and improve it.
