shawfactor

Why should your users prove that they’re humans by filling out captchas? Let bots prove they’re not bots with the <a href="http://lhero.org/plugins/lh-zero-spam/" rel="nofollow ugc">LH Zero Spam plugin</a>.
LH Zero Spam blocks registration spam and spam in comments automatically without any config or setup. Zero Spam was initially built based on the work by <a href="http://davidwalsh.name/wordpress-comment-spam" rel="nofollow ugc">David Walsh</a>, but enhanced with simpler code base and unobtrusive JavaScript.
Major features in LH Zero Spam include:
<ul>
<li>No captcha, because spam is not users’ problem</li>
<li>No moderation queues, because spam is not administrators’ problem</li>
<li>Blocks spam registrations & comments with the use of JavaScript</li>
<li>Blocks buddypress spam registrations with the use of JavaScript</li>
<li>Blocks woocommerce spam orders with the use of JavaScript</li>
</ul>
Like this plugin? Please consider <a href="https://wordpress.org/support/view/plugin-reviews/lh-zero-spam/" rel="ugc">leaving a 5-star review</a>.
Love this plugin or want to help the LocalHero Project? Please consider <a href="https://lhero.org/portfolio/lh-zero-spam/" rel="nofollow ugc">making a donation</a>.

LH Zero Spam

The plugin itself works perfectly and if you like lightweight unobtrusive solutions it is the way to go



Ben Marshalls commenty is unhelpful

Zero Spam makes blocking spam comments and registrations easy.

blackmelvyn

tiger

This plugin has been developed by BlackMelvyn from this <a href="http://www.theblackmelvyn.com/" title="SEO Black Hat blog" rel="nofollow ugc">blog SEO Black Hat</a> thanks to a script coded by Tiger from <a href="http://www.seoblackout.com/" title="Référencement Google" rel="nofollow ugc">Blog SEO BlackOut: Techniques référencement Google</a>. 
It compares the language contained in the comment text to the languages that you allow in your admin panel for this blog. 
There is a minimum confidence index that should be reached for the comment to be considered as valid. 
Then, if the comment is sorted a valid, it is held for moderation. 
On the other hand, the plugin counts the number of links contained in the comment, and if there is a suspicion of comment spam, it blocks the comment and adds it to trash. 
Finally, you get rid of all these automated spam bots that try and spoil your blog with their nasty unuseful comments, you save database space and you save time as you do not have to sort out what is spam and what is not! 
We recommend that you use this plugin in conjunction with the keywords filter built in WordPress for more efficiency.

Language-based Comment Spam Condom

This plugin prevents comments spamming using language verification.

LH Zero Spam vs Language-based Comment Spam Condom