Despite my cringing at some of the corpospeak, Microsoft's blog post on officially putting out Zork Trilogy source MIT-licensed seems to me like a neat development. Might be interesting to compare to the existing abandonware repos, too. *peers lightly in xyzzysqrl's direction as seems semi-obligatory*

Also interesting to read this paragraph in the first repo's README: “In general, Infocom games were created by taking previous Infocom source code, copying the directory, and making changes until the game worked the way the current Implementor needed. Structure, therefore, tended to follow from game to game and may or may not accurately reflect the actual function of the code.”