The GNU MDK ( GNU MIX Development Kit ) is a software package for developing, running and debugging programs written in MIXAL, an assembly language-like language for programming a fictional computer called MIX.

Both MIX and MIXAL were created by mathematician and computer scientist Donald Knuth in the first volume of his landmark textbook trilogy The Art of Computer Programming , published in 1968 (and updated as recently as 2005). The GNU MDK, published in book form in 2002, was written by theoretical physics PhD Jose Antonio Ortega Ruiz of Barcelona, Spain, and is released under the GPL, to allow and encourage users to freely share and improve the software. Current versions of MDK for different platforms are free to download from the project web site.

The MDK package consists of the following programs:

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