And Mark V. Shaney was designed by Rob Pike and posted on Usenet, but that happened a long time ago:

https://en.wikipedia.org/wiki/Mark_V._Shaney

About a decade ago I somehow came across Genudi[0], a markov chain based "AI", and had quite a bit of fun with it. The creator has a blog that makes for an interesting reading session.

0: https://www.genudi.com/about

This one too:

http://c9x.me/cbits/