Moo!
Here's an interesting variant of the minimal esolang called cow!
The awesome COW turing-completeness proof:
https://bigzaphod.github.io/COW/semantics-cow-english.pdf
Link to my fork of the cow compiler:
https://github.com/SinaKhalili/COW
Cowsay in cow:
https://github.com/SinaKhalili/cowsay-but-in-cow
Original cow website:
https://bigzaphod.github.io/COW/
Online cow interpreter:
http://www.frank-buss.de/cow.html
COW on esolangs:
https://esolangs.org/wiki/COW
Sweet background music made by Arefugee AKA Aref the Chef: