GDPR didn't give you cookie banners, it's shitty websites that do.
If they were to just follow activated "Do not Track"-Preferences, they wouldn't need to ask, instead they would deactived them by default. Or you could just not use cookies, it's not like somebody forces you to give cookies out to your website's users.
For me it's phpBB. It's even actively developed to this day and Open Source.