Where can I find the site core script?

Question

CMS

with a complete authorization system
with an easy-to-understand code

Answer 1

https://github.com/nazar-pc/CleverStyle-CMS
I can advise my development.
There is a system of authorization and access rights, you can enter through the social. networks, there is documentation in the wiki

Answer 2

take some framework? well or CMF - for example Drupal?