I'm writing a bug report of a software which is about an Article Management Software and deals with a lot of comment issues. I need a word for someone who posts a comment. I thougt about the comment writer, author of the comment, etc. but none sounds what I want. Is there a word for someone who writes/posts a comment?
You could use commenter or commentator, although correct it suggests heavy commenting in the style of scholar articles about an author. Therefore maybe comment poster if it's on a Web resource.
In your particular case, you could increase the use of the actor: i.e. test participants commented about.... Given that talking of the participants would imply that their main output is comments regarding what they have been shown.