Is there a framework-based CMS for bulletin boards (like Yii, Laravel, Symfony, etc.)?

Question

PHP

Do not offer Yboard, it is generally difficult to call "this" an engine

Answer 1

Kodkanyon has a lot of board engines, and they are all very well written. If you need a solution based on such monsters, write better yourself.
From experience, you can open and understand a canyon engine in 4 days. They usually don’t give direct documentation to the code, but, as you know, the best documentation is good code