Oh my friends, I have wonderful links for you!
Via Slumbering Lungfish, blog of the deeply hilarious Lore Sjoberg, I was directed to Garkov. Garkov is a site that takes old Garfield strips and cranks the dialogue through a Markov Chain, a stochastic substitution/shuffling process that has been used in chatbots like ELIZA (although not in the code for Eliza specifically, as far as I’m aware). The results are often gleefully insane.
But Garkov also has a treasure trove of Garfield-related links on its main page, ranging from the Garfield Variations to the Garfield Randomizer, to Nothingfield (which seems to have been directed by Ingmar Bergen). My personal favorite? Barfield: the one with the fart jokes.
Also well worth seeing: a Garfield/President Garfield mashup from the frozen north. The artist doesn’t seem to have links that lead to individual comics, but you’ll find it if you scroll down the page.