zlacker

Inform is the most direct descendant of Zork. It was inspired by the work of Infocom, a company founded by most of the authors of the MIT Zork. Folks especially enamored of Zork should start there. Inform has some support for displaying images.

>>kevinm+(OP)
Inform is not a descendant of Zork, it has no connection to it besides producing output files in ZMachine / Z-Code format, which is well-specified so that anyone can write a generator.

As far as programming the actual story goes, it's an independent implementation based on entirely different principles (Zork was written in MDL which was a Lisp).