Advanced Guestbook is a PHP-based guestbook script. It includes many useful features such as preview, templates, e-mail notification, page spanning , picture upload, templates, html tags handling, smilies, advanced guestbook codes and language support. The admin script lets you modify, view, and delete messages.
Developer: proxy2.de Platform: linux, windows, freebsd, osx, sun Date upd:2006-08-19 Hits50616 [Download] [Visit]

Comdev Guestbook is designed to gather unsolicited reviews from your website visitors. We have designed it to be simple and easy to plug into your web design page without much effort of layout customization. Among the features supported are:- Anti spam with image verification,
Developer: Comdev Platform: linux, windows Date upd:2007-06-03 Hits1360 [Download] [Visit]

This is a text file-based guestbook that doesn't use any database. It is solely written in PHP and should run anywhere. Feel free to adapt it to your design.
Developer: circle.ch Platform: Unix, Windows Date upd:2000-07-27 Hits13632 [Download] [Visit]

mySQL-Guestbook is a highly flexible guestbook written in PHP that uses mySQL database. It is really easy to configure and it supports cookies to automatically fill in name and email fields.
Developer: rafcrash.oltrelinux.com Platform: Date upd:2000-10-22 Hits3414 [Download] [Visit]

A non-sql GuestBook, written in PHP, and allows users to post smilies and customize text and much much more!!! This script is free and editable
Developer: Rocking Groudon Platform: Date upd:2005-09-14 Hits1020 [Download]