Guestbooks allow visitors to your web site to sign in and leave a message.
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Can be added in to any webpage. File based utiliy with configurable look and feel. [Freeware]
PHP Smart Guest Book
Flash and PHP based interactive animated guestbook. [Commercial]
Fully templated PHP/MySQL guestbook which allows unlimited custom fields. [Free with crediting text in footer and outgoing emails or commercial]
YapGB - Yet Another Php GuestBook
A free guestbook system that does not require an external database. Features: edit/delete messages, fully customizable appearance through a theme system, admin notification and custom timezone.