The MDL source code to Zork is also very beautiful. It brought back wonderful memories! Somebody's put it up on github so it's easy to read (just 8 days ago, holy plate of shrimp!):

https://github.com/itafroma/zork-mdl

PS: It uses lots of GOTOs, but not the harmful kind!

RMS -vs- Doctor, on the evils of Natalism:

http://www.art.net/~hopkins/Don/text/rms-vs-doctor.html

Interesting that they would chose to implement BBN-LISP in Perl, given that the ability to easily run legacy Lisp programs was one of the design goals of Common Lisp.

They have multiple versions of Eliza. James Markevitch wrote the interpreter for the 1966 version[0], but they ported 1969 and 1972 versions of Eliza to CL[1].

[0] https://github.com/jeffshrager/elizagen/blob/master/doctor_b...

[1] https://github.com/jeffshrager/elizagen/blob/master/cosellel...