BalfComment is a newly written (July 2019) comment system powered by Maria DB/MySQL and PHP. You can see it in action at the bottom of this page.
Being part of my own Web Neutral Project it follows the pattern of not implementing styles that would force you to modify it heavily. It allows the website developer to focus on developing the site and just installing a quick PHP script that deals with comments.
I also developed BalfComment in an object-oriented manner using the latest techniques.
Getting started couldn't be easier. Head to my Download Center and download the PHP script to get started.