I ready "indy" as Independent. To me, that just means self published without a publishers backing.

I plan to submit Splash of Code, which teaches brand new developers JavaScript by creating art. It's designed like the books I grew up on where you simply copy the authors code and then run it, plus it includes additional explanations.

https://splashofcode.com

I don't know any definition of "indy" that means "little public information".

Maybe a voting mechanism would float the good stuff to the top and maybe that's planned if the site catches on. Bravo to the builder.