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AnotherGuestbook is a free PHP guestbook script. It includes an installation script for easy installation.
Price: Free (GPL)

APBook is a free PHP/MySQL guestbook script.It has many features such as templates, flood protection, bad words filter, IP logging, e-mail notification for admin and posters, APBcode, preview post, Admin-Center and many more.Currently APBook is only available in German, but translations into other languages will follow soon.
Price: Free (GPL)

The flat-file version of Aplomb Guestbook. This flat-file guestbook does everything you'd want a guestbook to do. Because it is flat-file, no mySQL database is needed. Built in PHP, Aplomb Guestbook 2.0 features IP logging, HTML tag stripping, style sheet support, templates, an easy to use configuration system and more. Webmasters will find Aplomb Guestbook easy to install, and customize. Installation is simply editing a simple file, and uploading, whilst customizing the look is done in simple header and footer files.
Price: Free (GPL)

Ardguest is a simple guestbook script that uses a flatfile to store messages. It's suitable for anyone who need a guestbook that can be set up quickly. Features: multi-page display, ability to delete unwanted entries, email notification when someone signed the guest book, and more. HTML code has been optimized in this version.
Price: Free (GPL)

A full featured Gusetbook written in German. Featires: Multi-administrator, Delete guestbook entries, change every aspect of the design online, secure Login and User System, only one mySQL-Table It includes smilies and the BB like hypercode. Reqiures mySQL and PHP 4.xx.
Price: Free for non

A well designed, configurable and secure guestbook. Features: Easy installation, Several templates, Language file, Easy translation, Highly configurable, Anti-hacker features, Statistics page, Search function, Crypted emails, Powerful administration, and more.
Price: Free (GPL)

BBooK is a fully functional PHP polish guestbook. Simple and easy to use. Easy to customize. Features: HTML tag stripping, ICQ online status, 46 Smileys, 24 Avatars.
Price: Freeware

Big Sam, stands for "Built-In Gestbook Stand-Alone Module," is a PHP guestbook script that you just have to place on your public html files directory, and it theoretically should work without any particular manipulations.
Price: Free (GPL)

A guestbook script using text files for saving the data. Features: Web admin page, to delete unwanted entries, css for colours and styles, Smilies, Bad Word Filter, "ubb" code. Written in German.
Price: Free

Board3 is a Guestbook / Tagwall program with many useful features such as Edit, BlockTags, easy customization, and more. Board3 is based on text files so it doesn't require mySQL.
Price: Free