JamRizzi Technologies

<ul>
<li>Allow anyone to sign your guestbook or limit it just to users.</li>
<li>Lives in a standard WordPress page and uses comments for entries</li>
<li>Uses WordPress built-in moderation and antispam functionality</li>
<li>Two-View layout provides one view for submitting entries and another for reading them</li>
<li>Compatible with mobile themes</li>
<li>No custom database tables are required</li>
<li>Simplistic design makes it extremely user friendly</li>
<li>Add a date stamp so you know when people signed your guestbook</li>
<li>Change the view names</li>
<li>Internationalization support</li>
<li>Google reCaptcha support</li>
<li>100% free and open source</li>
</ul>

Rizzi Guestbook

Create a guestbook using the built-in commenting capabilities of WordPress

jarim

<a href="http://www.poorbuk.com/wordpress/jarim/libro-de-visitas/" rel="nofollow ugc">For live example click here!!!</a>
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LIBRO DE VISITAS- GUESTBOOK is the WordPress guestbook you’ve just been looking for. Beautiful, responsive,easy and multi-language. 
Creates its own table for messages so you can easily control all your messages.
Where is the plugin in the admin menu? 
Is in SETTINGS-> LIBRO DE VISITAS 
and also in 
PLUGINS->LIBRO DE VISITAS(where you see all plugins)->SETTINGS 
(a small menu under the name of the plugin, just beside Activate and Deactivate).
Current features include:
<ul>
<li>Easy to use guestbook frontend with a simple form for visitors of your website.</li>
<li>Responsive.</li>
<li>You can change the labels (Message,name,button-send) to any language you like from admin menu.</li>
<li>Simple and clean admin interface that integrates seamlessly into WordPress admin.</li>
<li>Easy uninstall not harming your wordpress installation in anyway.</li>
</ul>
… and all that integrated in the stylish WordPress look.
<h4>Languages</h4>
<ul>
<li>ALL</li>
</ul>
You can change the labels of the form (Message, name, button-send) to any language from the admin menu

Rizzi Guestbook vs LIBRO DE VISITAS – GUESTBOOK