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Automatic/Admin approval of new entries, Admin can alter messages or delete them, Includes a bad word filter, Can easly delete old messages, Error checking (HTML tags and stuff).
Price: Freeware

Guestbook is a classical script who visitor can write some word or leave comments about your web site.
Price: Freeware

WebGuestbook allows users to manipulate a guestbook HTML file dynamically by adding their own entries to the document. Thus, you can create a virtual guestbook that visitors can sign, leaving their contact information and perhaps comments about your pages. WebGuestbook is configurable so that you can specify what your guestbook file looks like and how the script-generated responses are displayed. Most of the configuration takes little more than a knowledge of HTML, so it is fairly easy to use. If configured to do so, WebGuestbook will email the guestbook administrator the text of new entries as well as add them to the guestbook. The script will also respond to new entrants with a configurable "Thank you" message. Thus, there is no need to continually monitor the page. Finally, the application comes with the capability of "four letter word" filtering for a child-safe guestbook. You can censor words by adding them to a list of "bad words."
Price: Freeware

Processes input from a web-based form.
Price: Freeware

This guestbook program is no ordinary guestbook CGI! It edits a web page and is not generated by CGI on the fly. This means that when users view it, it comes up much faster! It is also easy to update; you just edit the head file. It can even support as many guestbooks as you want! Run a guestbook for a friend. The new version can send e-mail if you so wish. It takes 3 min to set up, or to make a new guestbook.
Price: Freeware

A guestbook script with totally definable required fields, confirmation and validation of user input. Optional email thank you and notification, option for HTML filtering. Newer entries shown first with older entries viewable by following a link at the bottom of the page.
Price: $30.00

Visitors can use the program to leave comments about your site. The program can also be used as a message board.
Price: $19.95

GuestCall 2000 is much more suited for large web sites than before. With new "multi-page" support, a site with virtually unlimited number of posts can configure GuestCall to divide postings on to multiple smaller pages - similar to how search engines divide results. Now you can prevent unwanted HTML code in postings through automatic HTML filtering. This protects you from visitors placing images, redirects, SSI's, and JavaScript in their postings. Prevent visitors from messing up you guest book with long lines of characters or words without spaces by using GuestCall's word "splitting" feature. Keep tabs on the type of browsers your visitors use, and the times they post with the handy posting logs. Keep your guest book free of inappropriate language with easy to setup keyword filtering. Simply tell GuestCall what to remove from messages, and you can quit worrying. GuestCall 2000 is even more compact by combining log and message files into one more efficient data file.
Price: Freeware

GuestFriend is a guestbook that has been designed to be fully customizable and easy to install. All text and layouts are customizable just by editing the HTML files with your web editor. You can also add your own images and graphics to these HTML files. Guestfriend is a simple cgi application that can add value to your site by making it more interesting and interactive for your visitors.
Price: Freeware

GuestPost is a neat Guestbook for you to use. If your {REMOTE_HOST} has been blocked, this script will detect the IP's address as if it wasn't blocked. This guestbook can be fancy or simple. This script has a clean and organized layout. Can be customized 100%, extremely easily with the template editor.
Price: Freeware