alexmoskovsky

Provided by <a href="http://multitoolbox.com/" rel="nofollow ugc">Multitoolbox</a>.
Simple, but strong captcha, built to prevent spam in WordPress comments. Succesfully blocks Xrumer-like tools.
To leave a comment on your blog, visitors need to simple check the captcha’s field. That’s all! Forget about annoying typeing of letters and digits.
Features:
<ul>
<li>Extremely simple passing for human;</li>
<li>Built-in id’s and function name’s generator to produce unique and random values, Xrumer won’t pass;</li>
<li>Catchy look, you commentators won’t miss;</li>
<li>Captcha’s code will be pasted into the comment form via JavaScript, so spam-bots will get a big parsing problems; </li>
<li>Comment text saving, so if commentators forgot to check captcha’s field, they never have to write commen again.</li>
</ul>
Languages:
<ul>
<li>English;</li>
<li>Русский;</li>
<li>Український (thanks to <a href="http://sweatego.ru/" rel="nofollow ugc">Sweat Tony</a>);</li>
<li>Italiano (thanks to <a href="http://sweatego.ru/" rel="nofollow ugc">Sweat Tony</a>).</li>
<li>Čeština (thanks to <a href="http://spa-ostrov.ru/" rel="nofollow ugc">Zeleny Rajce</a>).</li>
<li>Français (thanks to <a href="http://www.android-software.fr/" rel="nofollow ugc">Laurent</a>).</li>
<li>Беларуская (thanks to <a href="http://pc.de/" rel="nofollow ugc">Marcis G.</a>).</li>
</ul>
Amcaptcha is bulletproof solution tested on many blogs.

Amcaptcha

Simple, but strong captcha, built to prevent spam in Wordpress comments. One-click solution tested on many blogs!

chimein

Brand-hosted forums FACILITATES communication all the way across the customer life cycle. A website with visitor feedback is much more trusted than one without it. ChimeIn adds a dialog layer to your page without interfering with your content.
Fetaures: – simplest to add to site – as a separate layer, you have no legal liability on user generated content – ChimeIn does basic moderation of reported posts 
– ChimeIn user notifications create a social hook that makes your visitors return
As a free user, you will get limited moderation rights. By subscribing for ChimeIn you will get: – highlighted posts – you can highlight the most constructive visitor posts – insights and analytics on visitor behavior, content and sentiment
Don’t take the dialog to social media. It’s three times more likely that someone interested in you or your brand goes to your website, not your Facebook page. Don’t send them away, let them converse on your site.

ChimeIn Sidewall

Very easy setup, immediate dialog on the site.

Very simple, very efficient

Add Conversation to Your Site. ChimeIn adds a dialog layer to your page without interfering with your content.

Amcaptcha vs ChimeIn Sidewall