DMSGuestbook

It features a CAPTCHA system, hidden text, field validation, moderation and others.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• Every guestbook have his own language template
• Make your own language template in few minutes
• Set mandatory fields where user must be filled out
• Simple work on the attitudes over front-end (e.g. text color, guestbook width, border color...)
• Extended attitude possibility over the CSS file
• Preset DMSGuestbook caption text in different languages (e.g: german, english, swissgerman ...)
• Set text hidden in the DMSGuestbook (e.g. ip address)
• Captcha antispam (image, mathematically, reCAPTCHA)
• Manage the DMSGuestbook user entries. (e.g. name, message, url, ip address)
• Sidebar widget
• Email notification when guestbook post was to submit
• Administrator can review posts before shown this
• Create your own guestbook template (beta)
• Administrator can search entries in guestbook
• Gravatar function
• Multiple guestbooks
• Define a selectbox and fill this with your own data
• SuperGuestbook: One guestbook can have more than one language

What is new in this release:

• Fixed adding widget if more than one sidebar is available.

What is new in version 1.17.2:

• Fixed adding widget
• Fixed PHP notice
• Fixed jQuery namespace
• Language list in 'Basic' is sorted now
• Updated jQuery to version 1.7.2

Requirements:

• WordPress 2.1 or higher