table of contents
onsite
self-hosted
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includes an admin panel and uses a flat-file system - no SQL knowledge needed.
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PHP guestbook by taufik nurrohman
a lightweight script with some support for HTML input.
embeddable
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requires google forms.
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one of the more stylish options out of the box; most elements can be customized, but branding is not removable for free users.
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open source comment box with matrix account integration (required), and a default stylesheet that looks great on most sites. supports markdown and can be used with static site generators, such as hugo etc.
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while being very feature-rich, the styling is not customizable at all. needs the plus plan to remove advertisements.
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a comment widget powered by github issues!
offsite
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very limited customization options and a bit dated appearance-wise, but provides IP blocking, email collection, inbox notifications, custom input fields, as well as manual comment approval.