Ardguest is a free and easy to use Open Source PHP Guestbook, because a flatfile was used to store messages in Ardguest so that there's no database like MySQL or PostgreSQL needed. The easy-to-setup feature helps Ardguest be the chpice of most people who wants a PHP guestbook. With the help of the feature: E-mail notification of each new post, so you wouldn't have to continuously visit the guestbook.

Features of Ardguest:
- Multi-pages display,
- Ability to delete unwanted entries,
- Checking for required field warning messages for missing fields,
- Mail notification when someone signedthe guestbook,
- Image verification code and spam filter words,
- Support for both Windows and UNIX/Linux Web hosting.

Requirements:
- PHP 4 or Higher with session support enabled
- GD library (optional)