Not mine, but I found this to be really interesting as a language created by one person for their own use.
Also really interesting are the author's blog with articles on language design (for example his thoughts on exceptions, and how he added them to his language, then decided against them), and the change log for the language, showing its evolution.
Also really interesting are the author's blog with articles on language design (for example his thoughts on exceptions, and how he added them to his language, then decided against them), and the change log for the language, showing its evolution.
https://tibleiz.net/
https://tibleiz.net/copper/changes.html