See also:

https://esoteric.codes/blog/forty-four-esolangs-an-artists-m...

The linked article is the preface to the book, and the book appears to be based on the collection of blog entries from https://esoteric.codes/

Hi, I'm the author. Esoteric.codes is my blog on esolangs in general; the book is a collection of my esolangs in particular.

Also just to note that e.c had been on hold while I focused on the book, but I'm working on new posts, so please send anything new esolang-related my way!