aoto

Mimic Guard is an anti-spam plugin for WordPress mail and contact forms. It uses dynamic honeypots, submission time monitoring, and integration with major form plugins to reduce automated bot submissions.
<ul>
<li>Honeypot — Detects bots that fill hidden form fields</li>
<li>Time check — Flags submissions that are unrealistically fast after the form is shown</li>
<li>Form integration — Works with WPForms, Contact Form 7, comments, and more</li>
<li>Page caching — Optional AJAX honeypot injection when HTML is cached</li>
<li>Privacy — Optional IP anonymization when logging events</li>
</ul>
Configure minimum submission time, token lifetime, log list size, and more from the admin screens.

Mimic Guard

Block spam submissions with honeypot fields and submission timing checks.

Denis V (Artprima)

AP HoneyPot WordPress Plugin, based on Jan Stępień’s http:BL, allows you 
to verify IP addresses of clients connecting to your blog against the Project 
Honey Pot database. Thanks to http:BL API you can quickly check whether your 
visitor is an email harvester, a comment spammer or any other malicious 
creature. Communication with verification server is done via DNS request 
mechanism, which makes the query and response even quicker. Now, thanks 
to AP HoneyPot WordPress Plugin any potentially harmful clients are denied 
from accessing your blog and therefore abusing it.
<h4>Your Feedback Matters</h4>
Bugs to report? Feature requests? Criticism? New ideas? We want to hear from 
you! Do not hesitate. Get in touch with us and share your views.

AP HoneyPot WordPress Plugin

Hard to believe I've been using this fro over 3 years, and the previous one before for even longer. No I wonder this is still being maintained, but still using in the meantime. 

Updated 3 years ago and still works great

AP HoneyPot WordPress Plugin allows you to verify IP addresses of clients connecting to your blog against the Project Honey Pot database.

Mimic Guard vs AP HoneyPot WordPress Plugin